Here is the full list of all 49 How to Survive 2 achievements.
Kill 10 infected animals of each species.
Have all "Stamina" skills at the maximum level.
Successfully complete all of the elite quests.
Reach the maximum level with your character.
Successfully complete all of Kovac's challenges while keeping the pylon intact.
Drink 50 potions.
Kill 100 infected with traps.
Meet every character in the game.
Successfully complete half of Kovac's challenges while keeping the pylon intact.
Upgrade 10 weapons with modules.
Kill 5,000 enemies (of all types).
Hit a car under alarm with a trash can.
Kill 100 infected with flint-tipped fletched ammunition.
Kill at least 2 infected with one arrow or crossbow bolt.
Kill 50 nocturnal infected.
Kill 100 infected with silver bullets.
Prepare a first potion.
Kill 50 infected during a last stand.
Wear the Jester's hat for the first time.
Help an ally in trouble 30 times.
Kill 500 infected with a critical shot.
Finish Kovac's first challenge while keeping the pylon intact.
Finish Kovac's first challenge in co-operative mode (local or online).
Upgrade a weapon with modules for the first time.
Finish 15 co-operative quests (local or online).
Kill 1,000 infected humans.
Pick at least one of every type of plant.
Pick 20 locks.
Kill 10 infected with a Bomber explosion.
Pick a lock for the first time.
Give an ally an item for the first time.
Kill 2 or more enemies at the same time with a melee weapon.
Equip a pet for the first time.
Enter Kovac's bunker for the first time.
Finish your first co-operative quest (local or online).
Join a public camp for the first time.
Customize your survivor for the first time.
Kill an infected with a charged attack for the first time.
Have all "Survival" skills at the maximum level.
Have all "Weapon" skills at the maximum level.
Have all "Special abilities" skills at the maximum level.
Have all "In Danger" skills at maximum level.
Have the camp at maximum level.
Cook every type of recipe.
Prepare every type of potion.
Make every type of armor.
Make every type of weapon.
Finish each of the game's festive quests.
Finish every quest.