P3

To unlock a full comic, you must collect Cog Tags to unlock the pages. There are five total comics that you can read, but you only need to read one of them. Once you have unlocked a full comic you can view it in the 'Extras' menu and select the comic you wish to read. You can then scroll through the comic using the [RT] to the end and the achievement should unlock. If it does not, utilize the zoom function with (A) and slowly 'read' each page.

This can be a little glitchy for some reason. I had to 'read' a comic a few times slowly to get it to unlock. Some have reported that coming back the next day and reading the same comic has resulted in the achievement.

Play any online match and finish it and the achievement is yours! Although, some of you may not want to remember their first...

You must complete all 36 acts either in local or online co-op. This can be done two different ways. First, you can play local split-screen co-op with two controllers. Second, you can utilize the online campaign feature and play with random people or you can use the GamertagNation Forums to find a dedicated playing partner through the site.

Play and win 25 matches of Team Deathmatch. Team Deathmatch pits 4v4 with a finite amount of lives. In social or competitive matches the number of lives is 10. Once a team exhausts their 10 'extra lives' they will be down to their last spawns. So the team to bring that number to zero, and kills the remaining players on the map, wins. This will come eventually if you put in enough time and effort. You can complete this in Social or Competitive matches; or a mixture of both.

Even though the achievement description does not say specifically "social or competitive", this can NOT be done in private matches; it's been tested.

Just get one kill with each weapon in the game. There are 10 weapons total, and if you're bad at certain weapons, you'll eventually get a kill with one by blind dumb luck. Besides your starting weapons, the rest of the weapons are spawned on the map that you must get. Sometimes other players are doing the same, so get there first, or try to take turns.

Make sure that you actually get the kill.. a person downing an enemy and you shooting them will only count as an assist. You can down an enemy with one weapon and kill them with another if you wish.

Press [LB] (Tac/Com) while in a multiplayer match and it will show the weapon spawns on the map.

Starting Weapons:
Lancer
Gnasher Shotgun
Snub Pistol

Map Weapons:
Hammerburst
Boltok Pistol
Longshot Rifle
Boomshot
Torque Bow
Hammer of Dawn
Frag Grenade

This will probably prove to be the most difficult campaign achievement. You can do this in local or online co-op. You must defeat RAAM without either playing being downed on the Insane difficulty. As the most common strategy goes, one player uses the Torque Bow while the other snipes with perfect active reload head shots. The exploding arrows disperse the Kryll around RAAM leaving him vulnerable to fire; lay into him with head shots.

Optional: your teammate can switch to a primary weapon, like a Lancer, and put some extra damage on him in between Torque Bow shots. As he moves closer, use grenades and pump him full of lead! Should you fail, just reload the last checkpoint and try again.

You can only gain experience in versus online game modes. You can gain experience in Xbox Live private matches; but it's minimal at best and not a sustainable source of XP. You will gain experience for everything you do; but it mostly boils down to kills, wins and the consecutive match bonus. Without a doubt, this will take some time to accomplish.

Once you reach level 100, which requires you earn 3,851,750 experience, you'll have to visit the Statistics page to 're-up'. Once there, press (X) to re-up; the game will ask if you're sure, then press (A) to confirm. You'll revert back to level 1 and net yourself the achievement. If you're a Gears 3 veteran, you know all about re-upping; for those that don't.. think of it as a prestige.

CQC = Close Quarters Combat. Boxes is basically the War Machine map with a re-skin and the sides cut off. It is a small map which is only used for the 2v2 Gnasher Execution gametype. Though my understanding is that 2v2 Gnasher Execution is only available in the competitive playlist. I've yet to come across it in the social playlist.

You must shut out the opposing team during any given round. With this being added to public matches; the Koth and Blitz game types are only one round. So you must blank the opposing team for the entire match. In Annex the rings always spawn at a weapon spawn point.
If you don't have a second controller: You can play online in an Xbox Live private match with a second person and exchange wins. Or if the second person has a second controller, you can both be on the winning team against an idle bot.

This can be done in social or competitive matches, as the achievement description does not specify. So jump into your favorite ring-based game type and blast away. Remember, you can't allow the opposing team to score a single point or it will not count!

You just have to complete 100 matches (not win); but you must capture at least three 'rings' during the match. Since this Annex achievement can now be done via Koth and Blitz gametypes (which are only one round) you have to be on point with ring captures. Annex is very similar to the King of the Hill gametype. In Annex the rings always spawn at a weapon spawn point.

Easy way: Using a second controller logged in as guest, you can create an Xbox Live, private Blitz match. Have the settings at one round, 180 second win timer. It's you verse your bot. So just cap the points and win with ease. This can be done anywhere, but use a smaller map to make things go quicker. Using this method, a one round match should take no longer than four minutes each.
If you don't have a second controller: You can play online in an Xbox Live private match with a second person and exchange wins. Or if the second person has a second controller, you can both be on the winning team against an idle bot.

This can now be done in social or competitive matches, as the achievement description does not specify. So jump into your favorite ring-based game type and blast away. Remember, you must cap at least three rings during the match or it will not count!

Seriously kill lots and lots of people... seriously. This can only be done in Competitive matches! Playing KotH (King of the Hill) is a surefire way to rack up lots of kills as there is no kill limit, just a score. The boosting method would consist of two players with two controllers playing the 2v2 Gnasher execution matches; choose a region that is not your own and search at the same time and hopefully you find each other.

It is recommended that you play the KotH (King of the Hill) or Blitz gametypes as there is only one round to complete. So in reality, you can't lose a round even if you wanted to. Obviously you can do this in any gametype if your team is good enough. This can't be done in private matches!

You must win one match of any gametype on the following 20 maps. This can't be done in private matches!

Boxes
Bullet Marsh
Canals
Clocktower
Courtyard
Escalation
Fuel Depot
Garden
Gold Rush
Gridlock
Mansion
Mausoleum
Old Bones
Process
Raven Down
Rooftops
Sanctuary
Subway
Tryo Station
War Machine

Play and win a match of the following five gametypes:

Execution
Warzone
Team Deathmatch
King of the Hill (KotH)
Assassination

This could prove to be difficult for some. You gain points for kills, executions, revives, assists, spots that result in kills and capture points. You must have the highest total out of both teams, not just your team. You can even get the highest point total and be on the losing team. Just do your best and you'll get it eventually.

If you didn't know, a teammate can get downed when they eat too much lead! So if you see a team member on the ground gasping for breath, walk over to them and a prompt will show to revive them. Press (X) on your controller and your teammate will be brought back to life to rejoin the fray!

You probably won't achieve this during casual play, so you'll have to do a little grinding for it, but it's not that difficult to do. Grenades, Boomshot, and the Hammer of Dawn will make this easier if you get clusters of enemies.

You can do this as early as Chapter 1, Act 1, which is the tutorial level. When the Grubs are plasma cutting through the door, wait until the door drops and three Grubs will enter the room. Toss a grenade at their feet and hopefully blow them all up at once; then rinse and repeat.

This achievement must be done in online multiplayer; you can't do this in local online versus play. You can 'spot' players by clicking (LS) while aiming at them. This allows your fellow teammates to see their whereabouts, because an icon will show above their head, for a short time. This feature was not implemented in the original Gears of War.

Spot enemy players and hope that spot results in kill by a teammate. It is recommended you use spots at choke points where multiple players congregate and shotguns are being used then spot as many enemy players as you can. You can only spot one enemy player at any given time.

This takes place in Act 1 Fish In A Barrel. When you get to a water fountain, make sure you have at least two grenades on you as you can pick up two more inside the fountain itself. The emergence holes are always in the same location but will open in a different order each time you reload the checkpoint. Make sure you throw the grenade before the hole opens to ensure that no Locusts pop out. After you closed the forth hole successfully the achievement will pop up