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