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