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