Here is the full list of all 25 SpellKeeper achievements.
Collect all Keys in the Tower
Collect all Keys in the game
Complete all levels in the Tower
Unlock all achievements in the game
Unlock the thrid stage in the Tower
Complete all levels in the Castle
Collect all Keys in the Castle
Complete all levels in the Garden
Collect all Keys in the Garden
Unlock the thrid stage in the Garden
Unlock the second stage in the Tower
Complete all tutorials in the game
Unlock the third stage in the Castle
Unlock the second stage in the Castle
Collect all Keys in the Village
Complete all levels in the Village
Unlock the Tower
Unlock the second stage in the Garden
Unlock the Castle
Complete 10 levels without pressing Undo, Restart or Menu buttons
Unlock the thrid stage in the Village
Unlock the second stage in the Village
Unlock the Garden
Collect the first Key (not in the tutorial)
Complete a level in the game (not the tutorial)