Here is the full list of all 24 Teslagrad 2 achievements.
Collect 30 Cards
Defeat Galvan
Complete the game
Defeat Halvtann
Defeat Fafnir
Get the red polarity secret upgrade
Collect 20 Cards
Defeat the First Draug
Collect 10 Cards
Collect 5 Cards
Defeat Huldr
Collect 1 Card
Collect 40 Cards
Collect 50 Cards
Collect 60 Cards
Collect 70 Cards
Collect 80 Cards
Collect all Cards
Defeat Elenor
Get the directional blink secret power
Get the blink axe secret power
Get the double jump secret upgrade
Get the secret map
Get all achievements