Here is the full list of all 12 Amazing Princess Sarah achievements.
Make 8 hit combo
Reach a save statue while being at full health
Complete a castle without killing anyone but the boss
Reach a save statue while having only one health point left
Watch game's intro until the end
Rescue Sarah's father
Defeat the chasing ghost in Angry Princess
Complete a castle in less than 6 minutes while being drunk
Make Sarah reach level 69
Defeat a Fatty with a slap
Kill at least 500 enemies in a level while being a vampire
Defeat the Greater Lilith