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