Here is the full list of all 50 Tomb Raider achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Kill 20 enemy players in multiplayer using a turret.
Kill a zip-lining enemy player in multiplayer.
Win a ranked match in every multiplayer mode.
Kill 2 multiplayer enemies with a single explosive.
Kill FeeFee the crab.
Kill 40 enemies with the shotgun.
Kill and loot 10 large animals (deer, boar, wolves).
Loot 200 enemies.
Purchase all skills in one category.
Collect 5000 pieces of salvage.
Find 25% of GPS caches.
Kill 25 unaware enemies.
Kill and loot 10 small animals (rabbits, chickens, rats).
Shoot 10 enemies off zip lines.
Kill 50 enemies with the bow.
Force an enemy to drop dynamite that kills two people when exploding.
In multiplayer, escape death 3 times by using the rope ascender.
Shoot a bundle of dynamite out of the air.
Collect 25% of all relics.
Perform 50 headshot kills in the single player campaign.
Kill 10 multiplayer enemies using your melee attack.
Complete a match in all multiplayer modes.
Survive 10 explosions in multiplayer.
Revive a teammate in a multiplayer match.
Reach level 10 in multiplayer.
Kill 35 enemies with the pistol.
Find 25% of all documents.
Perform 15 finishers.
Complete one optional tomb.
In multiplayer, be the only player on your team that isn't dead or downed.
Catch a player in a snare trap in multiplayer.
Buy every upgrade and character in multiplayer.
Purchase a new multiplayer character.
Find 75% of all documents.
Collect 75% of all relics.
Find 75% of GPS caches.
Find all documents, relics and GPS caches.
Purchase all skills in all categories.
Fully mod and completely upgrade any weapon.
Fully mod and completely upgrade all weapons.
Kill and loot 10 flying animals (crows and gulls).
Kill 75 enemies with the rifle.
Rope pull 5 enemies off edges.
Incapacitate 25 enemies with dodge counter.
Complete all optional tombs.
Complete one challenge.
Complete all challenges.
Complete the game.
Complete all conversations with the Endurance crew.
Reach level 60 in multiplayer.