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