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