Here is the full list of all 99 Project Malice achievements.
Defeat Yuri with M Rank
Complete the Office
Kill Infected Mech with M Rank
Collect more than 30 different items in one run
Kill more than 200 enemies in one run
Kill Neckbeard with M Rank
Kill Gunface with M Rank
Ricochet 20 bullets off of coins
Kill your Mistake
Go from C Rank to M Rank in under 20 seconds
Die for the first time
Complete the Apartments
Complete the Gardens
Kill Manic Pixie with M Rank
Complete the Sewers
Reflect 100 projectiles as Tony
As Kate, deal 100+ damage in one shot
Grind for a total of 100m as Stigma
Complete Nothing
Discover the Hallways or the Aqueducts
Beat Samyntha's Challenge
Block/Dodge 200 projectiles
Stay overcharged for more than 20 seconds as Stigma
Read through the Malicindex for more than 5 minutes straight
Kill Abyssal Void Organ with M Rank
Have Something kill 30 enemies
Look at Man Tree for more than 30 seconds
Look at Sabrina for more than 10 seconds without angering her
Have 6+ status effects applied at once
Buy 100 items
Sell 100 items
Fire 5000 bullets
Reflect a bullet that's already been reflected
Collect more than 20 of a single item
Kill 30 enemies with spike traps
Kill a Gaslighter by setting them on fire
Destroy the AR-AK Droid with M Rank
Defeat Nite with M Rank
Die 10 times in one play session
Walk over 50 grass patches
Travel through vents 30 times
Have charm, fear, and rage inflicted on an enemy
Have blind, deaf, and silence infected on an enemy
As Kate, kill an enemy with a critical hit while at M-Rank
Quit the game immediately after dying
Pacify Zyra and Diago
Have more than $25,000 in piggy bank savings
Collect over $5000 in one run
Die to the same thing twice in a row
Shoot at the other P-Series Subjects while in the Refuge
Have 30 conversations
Revive 5 times in one run
Defeat Nite as Blayk... again
Inflict charm on a Succubus
Pacify Stephanie and Bonewolf
Defeat Zyra and Diago with M Rank
Defeat The Empress with M Rank
Learn the truth about The Maiden
Bounce off of 5 enemies without touching the ground
Quit the game while you have an M Rank
Pet Abigail
Complete the Flesh Labyrinth
Defeat QQQQ with M-Rank
Defeat Citri with M-Rank
Bounce off of Citri's chest
Set the difficulty to Project Malice Must Die
Die 69 times
Sell 10 Golden rarity items
Recruit an ally 10 times
Kill an enemy with a Hardshell's shell
Bring Trope Travis to the refuge
Get Ending 5A
Pacify Yuri Karda
Pacify Venice & Florence
Defeat Venice & Florence with M Rank
Die during the tutorial
Catch Aqua while fishing
Die while building a level
Defeat Marmot with M-Rank
As Blayk, fight alongside Nite and Marmot
Unlock 5 palettes
Unlock 5 weapons
Reach the Heart of Malice without taking damage
Reach the Heart of Malice with 8+ modifiers active
Kill an enemy after you've died
Complete the Hotel
Smooch someone as Kate
Play Project Malice while one of your Steam friends is also playing it