Here is the full list of all 15 RIPD: The Game achievements.
Use Salary to Purchase All Weapons
Execute 10 Deado Criminals
Fully Upgrade All Weapons
Win Every Bet
Win Your First Bet
Send Hayes to Judgement
Arrest 10 Deado Criminals
Unlock the Final Showdown with Hayes
Complete All Maps on the Hardest Difficulty
Beatdown 50 Deados Using Melee
Fully Upgrade One Weapon
Complete Every Challenge In One Level
Soul Kill 100 Deados
Kill 65 Deados
Complete Your First Challenge