Here is the full list of all 21 Headspun achievements.
Complete Scene 10
100% Cortex Restoration
Complete all R&D Projects
75% Cortex Restoration
Complete Scene 9
Complete Scene 8
Complete your Wardrobe
50% Cortex Restoration
Renovate all Rooms and Departments
Hire all ten staff members
Complete Scene 7
Complete Scene 6
Complete Scene 5
Aquire 10000 Neuro Credits
Aquire 5000 Neuro Credits
Complete Scene 4
Hire five new staff members
Aquire 1000 Neuro Credits
Complete Scene 3
Complete Scene 2
Complete Scene 1