Here is the full list of all 41 Megamagic: Wizards of the Neon Age achievements.
Finish chapter 2
Kill 50 enemies
Finish chapter 1
Pass the exam
Finish the prologue
Finish chapter 3
Finish chapter 4
Finish chapter 5
Finish chapter 6
Finish chapter 7
Finish chapter 8
Finish chapter 9
Finish chapter 10
Finish chapter 11
Finish chapter 12
Unlock Fulgomancy
Unlock Necromancy
Unlock Vegemancy
Unlock Sanctumancy
Decodify all the floppy disks
Kill 300 enemies
Kill 1000 enemies
Level up 30 summons to veteran
Find all the chests
Find all the life and mana upgrades
Find all the population upgrades
Try the multiplayer mode
Craft all the wild summons
Craft all the sidereal summons
Craft all the undead summons
Craft all the robot summons
Craft all the summons
Craft all the Neonmancy spells
Craft all the Fulgomancy spells
Craft all the Necromancy spells
Craft all the Sanctumancy spells
Craft all the Vegemancy spells
Craft all the spells
Win the Tourney
Get 100 hits at the minigame
Beat the game in standard difficulty or more (without changing to narrative)