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