Here is the full list of all 56 Grim Clicker achievements.
Kill 500 champions
Complete 100 quests
Complete 50 quests
Perform 50 rituals
Kill 10000 fireflies
Kill 20 bosses
Reach Zone 50
Remove three locks
Kill 10 bosses
Click 50000 times
Get 20 wisdom
Get 20 dexterity
Get 15 dexterity
Get 20 strenght
Kill 5 bosses
Find people on the shard
Get 15 strenght
Kill 1000 fireflies
Get 15 wisdom
Get 10 wisdom
Get 10 dixterity
Upgrade any item
Open 30 chests
Upgrade weapon to quality 15
Open 20 chests
Upgrade weapon to quality 10
Upgrade weapon to quality 5
Open 3 boss chests
Open shard chest
Open 10 chests
Get 10 strenght
Get level 20
Perform 20 rituals
Remove one lock
Kill 25 champions
Perform 10 rituals
Get 5 dixterity
Get level 10
Get 5 wisdom
Collect 500 candles
Get 5 strenght
Complete 10 quests
Upgrade any weapon
Kill 20 fireflies
Collect 250 candles
Collect 100 Candles
Reach Zone 10
Collect 50 Candles
Get level 5
Dissasemble any item
Open 1 chest
Perform 1 ritual
Reach Zone 5
Click 5000 times
Click 500 times
Kill 1 champion