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.
Reach level 10 in multiplayer.
Shoot 10 enemies off zip lines.
Shoot a bundle of dynamite out of the air.
Kill and loot 10 flying animals (crows and gulls).
Find all documents, relics and GPS caches.
Complete the game.
Complete all challenges.
Fully mod and completely upgrade all weapons.
Kill 75 enemies with the rifle.
Perform 15 finishers.
Kill FeeFee the crab.
Fully mod and completely upgrade any weapon.
Purchase all skills in all categories.
Complete all optional tombs.
In multiplayer, be the only player on your team that isn't dead or downed.
Collect 75% of all relics.
Find 75% of GPS caches.
Loot 200 enemies.
Kill 40 enemies with the shotgun.
Kill 35 enemies with the pistol.
Find 75% of all documents.
Purchase all skills in one category.
Collect 5000 pieces of salvage.
Kill and loot 10 large animals (deer, boar, wolves).
Force an enemy to drop dynamite that kills two people when exploding.
Collect 25% of all relics.
Complete one challenge.
Find 25% of GPS caches.
Kill and loot 10 small animals (rabbits, chickens, rats).
Perform 50 headshot kills in the single player campaign.
Find 25% of all documents.
Kill 25 unaware enemies.
Kill 50 enemies with the bow.
Complete one optional tomb.
Rope pull 5 enemies off edges.
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.
Revive a teammate in a multiplayer match.
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.