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