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