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