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