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