Here is the full list of all 25 Larva Mortus achievements.
Doubles damage done by the sword.
This trophy added 4000 points to your score.
Adds +10 points of extra fire damage to crossbow bolts.
This trophy added 1000 points to your score.
Raises the probability that some item or bonus is dropped from an exterminated monster
+10 points of extra damage to demons.
This trophy added 2000 points to your score.
Duration of bonuses is +50% longer.
Silver bullets do +100% damage to werewolves.
Pistol bullets do +25% damage.
This trophy added 3000 points to your score.
This trophy added 10000 points to your score.
Allows you to carry more ammunition for all weapons.
+10 points of extra damage to vampires.
This trophy added 5000 points to your score.
Adds 10 bullets in every machine gun magazine.
They give more lead to every shotgun blast.