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