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