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