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