Here is the full list of all 47 Gift of Parthax achievements.
Gain blood magic
Transform 10 enemies into chickens
Open an empty chest
Died 10 times
Died 3 times
First death
Complete a challenge with only frost spells equiped
Complete a challenge with only earth spells equiped
Complete a challenge with only Arcane spells equiped
After Parthax' death
Complete the entire game without a single death
Complete entire game using only fire as primary element
Complete blood moon season
Defeat Parthax
Purchase all runes available
Defeat 1000 enemies
Gain light magic
Complete winter season
Defeat Hrist
Collect 99 mana potions
Collect 50 mana potions
Collect 99 health potions
Collect 20.000 gold
Collect 50 health potions
Complete fall season
Defeat Nereus
Complete a challenge with only fire spells equiped
Defeat 500 enemies
Collect 10.000 gold
Complete summer season
Defeat Feykir
Damage more than 5 enemies with the effect of an explosive rune
Collect 5.000 gold
Collect 10 mana potions
Complete spring season
Defeat Mounorian
Defeat 100 enemies
Collect 10 health potions
Collect 2.000 gold
Purchasing first rune
Destroy all breakable objects for a season
Find all objects for a season
Open a chest with riches
Casting first ally spell
Complete the tutorial
Adding 4 of same kind of rune to a spell, first time
Read the introduction story