Here is the full list of all 33 RUINER achievements.
Complete CATS quest
Acquire all basic abilities
Kill 3 enemies with a one explosion
Finish Epilogue
Beat the game on Easy Difficulty
Beat the game on Normal Difficulty
Defeat Sisters
Collect all bounties
Use dash 9001 times
Achieve 15 kills combo
Defeat TrafficKing
Kill 75 enemies with a shield ram
Destroy 3 Angel cores in one go
Defeat Nerve
Perform 50 Ruiner kills
Reflect 100 bullets with your shield
Finish Prologue
Kill all Angels
Unlock all iChing fortunes
Beat the game without dying
Destroy Angel core in the air
Hit 50 mines with your melee weapon
Do 1003 pushups
Die 666 times
Burn 420 enemies with flamethrower
Destroy all dead Hosts' piles
Hack 50 enemies
Beat the game on Hard Difficulty
Finish NewGame+
Finish Speedrun
Acquire all outfits
Finish Arena:Colosseum
Score more than 50000 points in Arena:Colosseum