Here is the full list of all 23 8-Bit Invaders! trophies - there are 2 bronze, 13 silver, 7 gold and 1 platinum.
Complete mission 6 of the Cranioids campaign.
Complete mission 6 of the Galactic Marine Corp campaign.
Earn all other trophies
Find "Gwen" the penguin in each mission of the Cranioid campaign.
Complete the single-player campaign with the Cranioids faction.
Complete the Cranioids campaign with 2 stars in each mission.
Complete the Cranioids campaign with all stars in each mission.
Complete the Cranioids campaign at hard difficulty in each mission.
Complete all ten co-op campaign missions with at least one star.
Complete all ten co-op campaign missions with at least two stars.
Complete all ten co-op campaign missions and earn all possible stars.
Find "Gwen" the penguin in each mission of the Galactic Marine Corp campaign.
Complete the single-player campaign with the Galactic Marine Corp faction.
Complete the Marines campaign with 2 stars in each mission.
Complete the Marines campaign with 3 stars in each mission.
Complete the Marines campaign at hard difficulty in each mission.
Find "Gwen" the penguin in every mission of the 8-Bit Invaders solo campaigns.
Win a one-on-one skirmish game against one hard AI with the Cranioids faction.
Win a one-on-one skirmish game against one hard AI with the Galactic Marine Corp faction.
Win a team match against humans playing Marines and Cranioids.
As Marines or Cranioids, win against a human playing any other faction.
As Marines or Cranioids win a skirmish on hard without building more than one harvester
Complete 6 other (mystery) trophies to receive this trophy.