Unlock all trophies.
Complete the first mission of the campaign.
Kill your first enemy in combat.
Kill 100 Brood Warriors
Defeat the aliens in the jungle campaign.
Kill the last of the portal guardians and seize control of the portal to the alien home world.
Kill the templar.
Complete the single player campaign.
Kill the Dominator Leader.
Finish the desert campaign on Extreme difficulty.
Kill the alien commander leading the resistance to the orbital assault.
Buy a high quality item.
Sell a high quality item.
Have one of your units die in battle. Ouch.
Modify your strike team.
Use a commander skill.
Have one of your units reach level 5
Have one of your units reach level 10
Build your strike team manually.