Here is the full list of all 17 Sigi - there are A Fart for Melusina achievements.
Find the long lost golden grail.
Find the long lost golden talisman.
Collect all SIGI's.
Clear all caves.
There she goes again.
Defeat Ivan Stinkup.
Hard to find and almost out of reach.
Find the long lost golden crown.
An apple a day...
Defeat Kolles Terrol.
Defeat the Steel Horse.
Kill 100 Zombies.
Defeat Blind John
Fart at Melusina.
Collect 1000 coins.
In under 30 minutes?
Pocket 2500 coins.