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