Here is the full list of all 12 Wigmund achievements.
Slay Blodwyrt the Red Worm from Heols and the Dark Archon
Reach the maximum level in all professions
Complete most of the secondary quests
Acquire a paladin's weapon
Level up
Fish one King Mackerel
Discover the entirety of Frod Forest
Become a giant by using the potion of Giant Growth
Discover the Holy Grail
Restore the Paladin Armor
Fish a treasure casket
Adopt the stray puppy