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