Here is the full list of all 26 Spacejacked trophies - there are 3 bronze, 17 silver, 5 gold and 1 platinum.
Complete Act 2 of Story Mode
Complete Act 1 of Story Mode
Complete Act 1 of Story Mode without upgrading your blaster
Obtain all the trophies
Complete Story Mode without taking any hit to the cores
Beat wave 24 in Endless Mode
Get Perfect grade in said challenge
Beat the Impossible wave either in Challenge Mode or in Story Mode