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