Here is the full list of all 12 Startup Freak achievements.
Fire 10 employees in 1 sprint.
Have 24 employees at the same time.
Spend money on every marketing activity in 1 game.
Fire 5 employees in 1 game.
Reach $1 billion in cash.
Successfully sell a company.
Hire 5 people in 1 game.
Reach $1 million in cash.
Get offers from 2 investors at once.
Win the game with more than 50% share of the company.
Win the game with no more than 1 investor.
Make a feature with every upgrade.