Here is the full list of all 12 Altwaldheim: Town in Turmoil achievements.
Build a Farm
Build a Town Hall
Build a Residence
Build a Palace
Build everything there is to build
Find the lost city!
Some big person joins your army.
Get hold of a Schrockgespenst!
Show those pigs who's boss!
Get the strongest weapon and armor for Faustus
Defeat the final boss on normal difficulty.
Defeat the final boss on hard difficulty