Alien Breed 3: Descent Trophies
Hardcore
Complete any single player level using only the Blaster and Grenades.
To play through the Prologue, select it from the Free Play menu. You can play on any difficulty.

For the easiest time in earning this trophy, attempt this in Prologue on Rookie difficulty. There isn't a whole lot to say about this short level, as the level itself is pretty straightforward and should take no more than 20 minutes to complete. You can ignore all the items along the way and head straight to the objectives.

You will be getting both The Initiated and Hardcore at the same time. Complete this Prologue runthrough using nothing but the Blaster (pistol with infinite ammo) and Grenades. This means you are not allowed to use any of your other weapons, or heal yourself with Health Kits. Melee-ing enemies is fine, it won't affect the trophy. Thank you CaliGamer for the confirmation.

Distance yourself from enemies so that you can land in a few more bullets at them before they come charging at you, and if you ever find yourself getting ganged on or are close to, don't be afraid to slip in a Stun Grenade.

When you finish the level, you'll be taken to the main menu. Both trophies will unlock soon after.