Here is the full list of all 14 Lost In Purple achievements.
Get 100 gold
Get 1000 gold
Get 10000 gold
Complete 5 quests
Complete 10 quests
Complete 13 quests
Get 10 level
Destroy spaceship protector
Eliminate toxic ooze
Eliminate monster in the lair
Eliminate ancient crater bat
Eliminate mushroom keeper
Kill the king of giants
Kill the mystic head