Here is the full list of all 21 Braveland achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Sigurd defeated.
Game completed without using the easy level of difficulty.
Game completed using only the hard level of difficulty.
All warrior abilities learned.
Rain of Fire spell learned.
100 units encouraged.
Defense spell used 10 times.
All four equipment items on.
The best equipment of all four types on.
Three treasure chests collected.
Page on Facebook or Twitter visited.
Arakin defeated.
Acceleration spell used 10 times.
1000 damage inflicted to the enemies with Fire Arrow.
Two warrior abilities learned.
Fromm defeated.
Equipment item on.
Treasure chest collected.
Warrior ability learned.
You defeated the army without losing a single warrior.
Peasants have joined you.