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.
Purchase a new multiplayer character.
Revive a teammate in a multiplayer match.
Reach level 10 in multiplayer.
In multiplayer, be the only player on your team that isn't dead or downed.
Rope pull 5 enemies off edges.
Shoot 10 enemies off zip lines.
Complete all challenges.
Find all documents, relics and GPS caches.
Kill 40 enemies with the shotgun.
Kill and loot 10 flying animals (crows and gulls).
Find 75% of GPS caches.
Complete all optional tombs.
Purchase all skills in all categories.
Perform 15 finishers.
Complete one challenge.
Collect 75% of all relics.
Fully mod and completely upgrade any weapon.
Purchase all skills in one category.
Complete the game.
Shoot a bundle of dynamite out of the air.
Find 75% of all documents.
Force an enemy to drop dynamite that kills two people when exploding.
Kill and loot 10 small animals (rabbits, chickens, rats).
Kill FeeFee the crab.
Kill 75 enemies with the rifle.
Complete one optional tomb.
Collect 5000 pieces of salvage.
Loot 200 enemies.
Kill 25 unaware enemies.
Find 25% of GPS caches.
Collect 25% of all relics.
Kill 50 enemies with the bow.
Perform 50 headshot kills in the single player campaign.
Kill 35 enemies with the pistol.
Kill and loot 10 large animals (deer, boar, wolves).
Find 25% of all documents.
Fully mod and completely upgrade all weapons.
Incapacitate 25 enemies with dodge counter.
Complete all conversations with the Endurance crew.
Complete a match in all multiplayer modes.
Kill 20 enemy players in multiplayer using a turret.
Kill a zip-lining enemy player in multiplayer.
Catch a player in a snare trap in multiplayer.
Survive 10 explosions in multiplayer.
Win a ranked match in every multiplayer mode.
Kill 10 multiplayer enemies using your melee attack.
Kill 2 multiplayer enemies with a single explosive.
In multiplayer, escape death 3 times by using the rope ascender.
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.