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