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