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