Here is the full list of all 8 QUICKDRAW achievements.
Play 100 rounds on TRAIN.
Play 100 rounds on SALOON.
Witness all PUNISH animations in-game.
Destroy 50 targets in one game of Target Rush.
Destroy 100 targets in one game of Target Rush.
Unlock all characters.
Use all POWERUPS in-game.
Play 100 rounds on AEGIS.