Here is the full list of all 25 Larva Mortus achievements. It takes around 10-12 hours to unlock all of the achievements on Windows.
This trophy added 1000 points to your score.
Adds 10 bullets in every machine gun magazine.
This trophy added 4000 points to your score.
This trophy added 5000 points to your score.
Silver bullets do +100% damage to werewolves.
This trophy added 3000 points to your score.
Allows you to carry more ammunition for all weapons.
This trophy added 10000 points to your score.
Adds +10 points of extra fire damage to crossbow bolts.
Doubles damage done by the sword.
This trophy added 2000 points to your score.
Pistol bullets do +25% damage.
Duration of bonuses is +50% longer.
+10 points of extra damage to demons.
They give more lead to every shotgun blast.
Raises the probability that some item or bonus is dropped from an exterminated monster
+10 points of extra damage to vampires.