Here is the full list of all 43 Arkane Rush achievements.
Collect a total of 1000 essences
Collect a total of 2500 essences
Collect a total of 5000 essences
Defeat Malwe
Defeat Varta
Defeat the Magic Forger
Defeat all bosses
Collect the Arkane Staff
Collect the Fire Staff
Collect the Frost Staff
Collect the Thunder Staff
Forge 20 itens
Forge 50 itens
Forge 100 itens
Complete level one
Complete level two
Complete level three
Open a portal
Use 200 clones
Complete level one with only Ranks S or A
Complete level two with only Ranks S or A
Get 20 Ranks S on level two
Get 15 Ranks S on level three
Collect all the Elemental Staffs
Score 1000 points in 5 minutes
Score 2000 points in 10 minutes
Score 3000 points in 15 minutes
Complete the game without using any Potion
Flawlessly defeat an Orc
Flawlessly defeat a Fox
Flawlessly defeat an Ent
Flawlessly defeat a Golem
Flawlessly defeat Malwe
Flawlessly defeat Varta
Defeat the Magic Forger flawlessly
Explode 5 enemies simultaneously 15 times
Stun 5 enemies simultaneously 15 times
Be immune to damage by using Dash 200 times
Slow 5 enemies simultaneously 15 times
Complete the game with all Elemental Staffs
Complete the game at least once
Reveal the divine staff