VisibleRaptor5

This will unlock naturally (unless you are really good at it). Simply tap on a square next to a number. You will likely land on a mine. Some are very obvious. For example, if you see a square surrounded by eight "1s", tap that square in the middle and you will uncover mine and unlock the achievement.

You have to play one of the mini games and stay off for a while. The smallest time frame to remain away from the game is unclear. Some folks tend to stay off for a little as one week to as long as over a year to get this. A quick way of doing so is to set your PC to a year back, play a mini game, close the game entirely, set PC to correct time, reopen game and play one of the mini games. The achievement should unlock after this.