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