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