Here is the full list of all 14 Mutland achievements.
Cut the first tree
Cumulatively cut 100 trees
Cumulatively cut 1,000 trees
Piercing the first stone
Cumulatively piercing 40 stones
Cumulatively piercing 400 stones
Kill any zombie for the first time
Cumulative killing 50 zombies
Cumulative killing 500 zombies
Live the first night for the first time
Lived for the third time for the first time
Live the fifth night for the first time
Lived the tenth night for the first time
First death