Alien Breed 3: Descent Trophies
Frag-master
Use a Frag Grenade to kill 5 aliens at the same time.
Youll know an enemys stunned when they have this purple pulse emitting from their bodies. Remember, the longer you hold [L2 Button] , the further you can throw a grenade. Frags are always one hit kills against whatever aliens you encounter. Due to their abundance and the fact that they always come in packs, doing this on the Larvals is recommended.

Go for Immobilized at the same time as this trophy, since itll be easier to frag non-moving targets. Similar to the trophies in the first Alien Breed game, this time you must stun 5 enemies at the same time, as well as kill 5 of them simultaneously with one Frag Grenade blast.

A good place to attempt this is during Level 1 - Subversion. Right after you overload and destroy the Gyro, youll be told to go back to the Maintenance Room. Head on into the room on the back, and quickly rush to the Intex Terminal on your left and save. Kill the Mauler and a few Larval enemies so they don't get in the way, and head further to the back, where you will see 6-7 alien eggs. Larvals will spawn out of them shortly, so wait till a bunch of them group up, and before they jump at you, throw one or two Stun Grenades to stun them. You should easily be able to get a group 10-12 Larvals stunned here. Once they're stunned throw a well aimed Frag Grenade to finish them off in one burst.

If for some crazy reason you're having trouble, you can buy the Compact Detonation Item Upgrade to make earning this trophy easier. Stun 5 and then kill 5 with a Frag Grenade, and all three trophies will pop.