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