Here is the full list of all 20 Rebellion: A Rogue Souls Like achievements.
Die for the first time
Kill your first enemy
'Kill' 10 barrels
Kill the first boss
Recruit your first npc
Kill twenty enemies
Buy something on market
The king returns after being defeated
Made a squad with six members
Reach level 10
Reach level 15
Attack who help you escape from orlop
Kill some seller
Broke the wooden door
Reach Level 3
Leave the prison
Comeback to Castle
You kill the king...