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