Here is the full list of all 36 Jotun achievements.
The base game contains 33 achievements, and there is 1 DLC pack containing 3 achievements.
Defeat Odin in under 60 seconds.
Defeat Odin without destroying any spears
Defeat Odin without taking any damage.
Defeat Odin, the Allfather.
Defeat Odin without using any God Powers.
Beat the game 100%.
Defeat Hagalaz without taking any damage.
Defeat Hagalaz in under 60 seconds.
Defeat Hagalaz without knocking her down.
Defeat Isa in under 60 seconds.
Defeat Isa without taking any damage.
Defeat Isa using only the icebergs.
Defeat Kaunan without taking any damage.
Defeat Kaunan in under 80 seconds.
Defeat Fé without attacking her in melee.
Defeat Fé in under 25 seconds.
Defeat Fé without taking any damage.
Defeat Jera in under 25 seconds.
Defeat Jera without taking any damage.
Defeat Jera without killing a single vine.
Defeat Fé, the magnificent Cave jotun.
Defeat Fé without using any God Powers.
Find all of Ithunn's Apples.
Find all of the God Shrines.
Defeat Kaunan while at less than 10% health.
Defeat Kaunan, the terrifying Fire jotun.
Defeat Kaunan without using any God Powers.
Defeat Isa without using any God Powers.
Defeat Isa, the mighty Winter jotun.
Defeat Hagalaz, the mesmerizing Storm jotun.
Defeat Hagalaz without using any God Powers.
Defeat Jera without using any God Powers.
Defeat Jera, the unmerciful Nature jotun.
Beat Valhalla Mode without taking any damage.
Beat Valhalla Mode.
Beat Valhalla Mode without using God Powers.