Here is the full list of all 14 Super Mutant Alien Assault trophies - there are 12 bronze, 1 silver and 1 gold.
Beat the game in one run on epic difficulty, by yourself
Beat the game in one run on heroic difficulty, by yourself.
Make a gas ball travel at high speed.
Unlock all equipment.
Defeat a boss in under 10 seconds.
Activate 30 pressure machines with explosives.
Use your pulse belt on a cooking explosive.
Keep a booooomerang in the air for 30 seconds.
Kill 6 enemies with one sniper bullet.
Beat the game in one run on normal difficulty, by yourself.
Kill the galaxy 3 boss.
Kill the galaxy 2 boss.
Kill the galaxy 1 boss.
Wipe out an entire monarch flock with one sniper bullet.