The Title Update 3.7: Co-Op Assault Title update for World of Tanks: Mercenaries has 6 achievements worth 150 gamerscore.
Destroy 1000 tanks in multiplayer.
Destroy 4 enemy tanks in a single multiplayer match while using a French tank.
Research a tier X of each class.
Earn 15 or more spotting assist ribbons during a multiplayer battle.
Play at least five matches Ranked Battles.
Win and survive ten battles in a tier X.