Here is the full list of all 23 Void Vikings achievements.
Unlock the Skadi ship.
Destroyed 10 green enemies
Unlock the Surt ship.
Unlock the Tyr ship.
Pay off a masters degree education.
Pay off any education using only the original equipment.
Pay off any education with only one payment.
Pay off any education with all four electives equipped.
Melt down 5000 items.
Upgrade 5000 items.
Paid $1,000,000 on education loans.
Earned $100,000 in interest.
Get a 10x kill streak in Valhalla.
Get a 25x kill streak in Valhalla.
Get 1000 multi-kills in Valhalla.
Attempt high scores in Valhalla 25 times.
Destroy 1000 Special enemies.
Destroy 1000 Boss enemies.
Destroy 1000 Destroyer enemies.
Destroy 1000 Battleship enemies.
Destroy 10,000 Purple enemies.
Destroy 10,000 Yellow enemies.
Destroy 10,000 Blue enemies.