Here is the full list of all 37 Mothership Forever achievements.
Started your deep space patrol.
Taken 10 Flights
Taken 100 Flights
Fire 2,000 bullets
Fire 10,000 bullets
Fire 100,000 bullets
Fire 500,000 bullets
ONE MIIIIILLION BULLETS!
Did 10 Damage
Did 1,000 Damage
Did 10,000 Damage
Did 100,000 Damage
Deal ONE MIIIIILION DAMAGE to the Mothership.
Last a total of 19 minutes.
Lasted 10 hours in the field.
Reached Evolution 5
Reached Evolution 10
Reached Evolution 25
Reached Evolution 30
Reached Evolution 35
Completed Story Mode
Died in Endless Mode
Completed Rogue Mode
Had over 100 missiles in flight
Killed the Core Last
Killed Core using Jettisoned Boosters
Made the Mothership Kill itself
Fired Minigun for 30 seconds straight. This costs one MILLION dollars.
Killed Mothership using only the Laser
Killed Mothership using only Torpedoes.
Killed Mothership using only the Blaster
Killed Mothership using only Kinetic damage
Killed Mothership using only Missiles
Killed Mothership using only the Railgun
Killed Mothership using only Mines
Killed Mothership using only Sasha.
Died after the music began!