Tag CollectorG 5

Tag Collector G5:
Collect 25 Dog Tags

This achievement requires that you collect a cumulative total of 25 Dog Tags across all plays and replays of all missions. Dog tags are the game's collectibles and are frequently scattered across each mission. These can be gathered more than once and are very easy to find in most cases. There are more than 100 in the campaign, so grabbing 25 will be no problem.