Here is the full list of all 20 Redshirt achievements.
Win the game with away missions frequency setting at highest
Win the game with holodoctor intervention setting at highest
Win the game by getting to the top of the career tree.
Win the game by buying your way off the station.
Get hired for a job at least 3 ranks above your Career Rank, without being properly qualified.
Maintain a single romantic relationship for 21 days. What commitment!
Have at least 6 different items from the S.H.O.P. in your inventory
Host a Spacebook event for 3 or more people, where everyone turns up.
Get a 'like' on a Spacebook status or post
Add Astra as a Spacebook friend
Get back together with a former romantic partner.
Get at least four likes on any Spacebook post you make.
Your romantic partner was killed on an away mission
Get into more than 8 different romantic relationships in a single playthrough
Achieve 4 aspirations in a single playthrough
Win the game through the 'bribery' route.
Win the game by making friends with the right people.
Win the game by maintaining a romantic relationship with the right person.
Win the game through two different routes.
Win the game through all 5 different routes.