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