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