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