Here is the full list of all 16 Zombie Admin achievements.
Take 100 toilet breaks.
Take 100 coffee breaks.
Punch 50 shelves.
Complete all floors.
Get a perfect performance review on the management floor.
Get a perfect performance review on every floor.
Get a perfect performance review on the marketing floor.
Get a perfect performance review on the animal testing floor.
Complete 100 jobs.
Get a perfect performance review on the accounting floor.
Get a perfect performance review on the R&D floor.
Get a perfect performance review on the sales floor.
Get a perfect performance review on the lobby floor.
Get a perfect performance review on the warehouse floor.
Complete a floor without killing an undead coworker.
Started the first level.