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.
In multiplayer, escape death 3 times by using the rope ascender.
Kill 20 enemy players in multiplayer using a turret.
Win a ranked match in every multiplayer mode.
Complete a match in all multiplayer modes.
Incapacitate 25 enemies with dodge counter.
Kill a zip-lining enemy player in multiplayer.
Complete all conversations with the Endurance crew.
Rope pull 5 enemies off edges.
Kill 2 multiplayer enemies with a single explosive.
Catch a player in a snare trap in multiplayer.
Complete all challenges.
Find all documents, relics and GPS caches.
Kill 10 multiplayer enemies using your melee attack.
Revive a teammate in a multiplayer match.
Fully mod and completely upgrade all weapons.
Find 75% of GPS caches.
Purchase all skills in all categories.
Complete all optional tombs.
Collect 75% of all relics.
Kill and loot 10 flying animals (crows and gulls).
Find 75% of all documents.
Complete the game.
Fully mod and completely upgrade any weapon.
Survive 10 explosions in multiplayer.
Reach level 10 in multiplayer.
Purchase a new multiplayer character.
In multiplayer, be the only player on your team that isn't dead or downed.
Kill and loot 10 small animals (rabbits, chickens, rats).
Loot 200 enemies.
Force an enemy to drop dynamite that kills two people when exploding.
Purchase all skills in one category.
Kill 40 enemies with the shotgun.
Perform 15 finishers.
Find 25% of GPS caches.
Kill FeeFee the crab.
Shoot 10 enemies off zip lines.
Kill 75 enemies with the rifle.
Collect 5000 pieces of salvage.
Shoot a bundle of dynamite out of the air.
Collect 25% of all relics.
Kill 25 unaware enemies.
Kill and loot 10 large animals (deer, boar, wolves).
Kill 35 enemies with the pistol.
Find 25% of all documents.
Perform 50 headshot kills in the single player campaign.
Kill 50 enemies with the bow.
Complete one optional tomb.
Complete one challenge.