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