Here is the full list of all 11 Unishroom achievements.
Successfully leave Mush City
Survive the Forest of Evils
Successfully leave the Mines of Horine
Survive the Deadly Desert
Dunno, but good job
Finally, I can sleep
DON'T LET YOUR JOURNEY END HERE
Realize that you can't eat a marshmallow
Don't get caught by the dragons
You are officially a rude mushroom
Goodluck sleeping