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