Here is the full list of all 20 Void Wizard achievements.
Get a score of at least 5,000.
Get a total score of at least 20,000
Get a total score of at least 10,000
Find the real real world.
Get a score of at least 500.
Get a score of at least 1,000.
Get a score of at least 2,500.
Get a total score of at least 5,000.
Get a total score of at least 2,500.
Get a total score of at least 1,000.
Get a score of at least 250.
Defeat the void wizard.
Get a score of at least 50.
Get a score of at least 100.
Loop at least once.
Enter the "real" world.
Explode an enemy until they die.
Reach the mines.
Buy something.
Finish the tutorial.