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