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.
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.
Kill 20 enemy players in multiplayer using a turret.
Complete all conversations with the Endurance crew.
Incapacitate 25 enemies with dodge counter.
Shoot 10 enemies off zip lines.
Shoot a bundle of dynamite out of the air.
Rope pull 5 enemies off edges.
In multiplayer, escape death 3 times by using the rope ascender.
Kill 2 multiplayer enemies with a single explosive.
Survive 10 explosions in multiplayer.
Kill 10 multiplayer enemies using your melee attack.
Kill a zip-lining enemy player in multiplayer.
Win a ranked match in every multiplayer mode.
Revive a teammate in a multiplayer match.
Complete a match in all multiplayer modes.
Purchase a new multiplayer character.
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 all weapons.
Kill and loot 10 flying animals (crows and gulls).
Catch a player in a snare trap in multiplayer.
Complete the game.
Find all documents, relics and GPS caches.
Purchase all skills in all categories.
Kill 40 enemies with the shotgun.
Fully mod and completely upgrade any weapon.
Complete all challenges.
Kill FeeFee the crab.
Complete all optional tombs.
Find 75% of all documents.
Collect 75% of all relics.
Find 75% of GPS caches.
Kill 25 unaware enemies.
Kill 75 enemies with the rifle.
Loot 200 enemies.
Kill and loot 10 small animals (rabbits, chickens, rats).
Perform 15 finishers.
Collect 5000 pieces of salvage.
Purchase all skills in one category.
Kill 50 enemies with the bow.
Perform 50 headshot kills in the single player campaign.
Kill 35 enemies with the pistol.
Force an enemy to drop dynamite that kills two people when exploding.
Find 25% of GPS caches.
Collect 25% of all relics.
Find 25% of all documents.
Complete one optional tomb.
Complete one challenge.
Kill and loot 10 large animals (deer, boar, wolves).