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