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