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