Here is the full list of all 15 Invasion: Brain Craving achievements.
Rerolled your game!
Recruited Blue. Ga-ry, Ga-ry, Ga-ry!
Recruited Aisha.
Awoooo! Awoooo! Defeated the Werecar miniboss.
Defeated 150 Unholy Dead!
Defeated 100 Unholy Dead!
Defeated 50 Unholy Dead!
Recruited Red. .... ..... ....... ....
Recruited Doc Brown. Now if only we could go back in time!
Recruited Clarissa.
Recruited Jeth.
Recruited Peach. She was in this castle all along, hero.
Defeated 10 Unholy Dead!
Defeated your first Unholy Dead!
Enter Post-Apocalyptia