Here is the full list of all 42 Soul Survivors achievements.
Kill 5 Mimics
Collect 1,000 Souls
Collect Nibbler's Cheese in the Catacombs
Collect 10,000 Souls
Collect 100,000 Souls
Collect 1,000,000 Souls
Defeat the Flesh Golem
Defeat Bloodsap
Defeat Chancellor Autlaic
Defeat Velya
Collect 500 Gold in a Single Run
Kill 500 Zombies
Kill 1,000 Skeletons
Kill 50 Mimics
Use 3 Sacrifice Altars
Kill 1000 Flies
Max all Talents for the Bogatyr
Max all Talents for the Necromancer
Take No Damage for 5 Minutes
Take No Damage for 10 Minutes
Survive 5 Curses
Collect 100 Flesh Piles in a Single Run
Destroy an Entire Fly Swarm
Kill 1,000 Enemies with the Flail
Defeat Warden Grainloch
Defeat Bilee
Max all Talents for the Ranger
Activate 3 Cursed Altars
Max all Talents for the Shadow Monk
Discover 15 Tomes of Knowledge
Defeat Sporelord Rotwood
Defeat the Ebon King
Defeat the Midnight Gatekeeper
Defeat Soulus
Defeat Lady Nox
Survive 10 Curses
Defeat Nibbler in Usvit Depths
Defeat the Ebon King without evading
Destroy 10 Gargoyle Statues in a single run
Burn 1,000 enemies with fire
Max all talents for the Pyromancer
Max all talents for the Blood Maiden