Here is the full list of all 12 Bionic Commando: Rearmed 2 achievements worth 200 gamerscore.
As the primary player, complete the game on hard difficulty.
Complete the game in coop mode.
As the primary player, complete all levels with both prestige upgrades equipped.
As the primary player, complete the game without jumping.
As the primary player, find all Yashichis.
Complete all challenge rooms.
As the primary player, obtain all bionic arm upgrades as the primary player.
Defeat the final boss.
As the primary player, kill 4 enemies with one barrel.
As the primary player, complete a level by only finishing off enemies with your bionics.
Defeat something huge.
Kill the miniboss in Puerto Cálao.