Here is the full list of all 97 Weak Soul achievements.
Choose your class
Finish the game any way you can
Buy something
Create something
Experience the bad effect
Experience the good effect
Make your first choice
Make a choice
Die again
Die for good
Find a treasure chest
Find the ancient construction
Take a break
Defeat a demon
Complete the game for the "omnivorous" class
Complete the game for the "impartial" class
Complete the game for the "hater of evil" class
Complete the game for the "stoic" class
Complete the game for the "posthumous hero" class
Complete the game
Find a dungeon
Find the unique enemy
Open all the inventory cells
Open all the skill cells
Experience 5 effects at once
Experience 10 effects at once
Create 10 items
Create 50 items
Create 100 items
Find 10 recipes for crafting
Find 50 recipes for crafting
Find 100 recipes for crafting
Find 150 recipes for crafting
Leave any event
Escape from the battle
Get a lot of health
Maximize any characteristic in the training area
Get level 20
Get level 30
Get level 40
Get level 50
Live for 10 days
Live for 50 days
Live for 100 days
Reach the edge
Decrease your karma
Increase your karma
Receive a reward for bad karma
Receive a reward for good karma
Make a choice 10 times in a single journey
Make a choice 50 times in a single journey
Make a choice 100 times in a single journey
Unlock 10 skills
Unlock 20 skills
Equip 5 soul items at once
Equip 10 soul items at once
Equip 15 soul items at once
Use any soul item
Break any soul item
Equip more than 2 attack skills
Find the World's End Shield
Find the Vortex Sphere
Equip Black crystal and Amulet of Forgotten Magic
Equip the appropriate skills
Defeat the Enemy