Seriously…
Kill every Templar. - Assassin's Creed
Get all MK Dragons in Test Your Luck - Mortal Kombat
Play on every game mode, and use every ability and ranged weapon once in Multiplayer. - Assassin's Creed IV: Black Flag (Xbox 360)
1,307/1,563905/1,00038/44
1,747/4,142560/1,00031/50
5,385/5,3852,000/2,00082/82