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