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