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.
Win a ranked match in every multiplayer mode.
Kill 20 enemy players in multiplayer using a turret.
In multiplayer, escape death 3 times by using the rope ascender.
Kill 10 multiplayer enemies using your melee attack.
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.
Reach level 10 in multiplayer.
Survive 10 explosions in multiplayer.
Kill 2 multiplayer enemies with a single explosive.
Kill a zip-lining enemy player in multiplayer.
Purchase a new multiplayer character.
Complete a match in all multiplayer modes.
Revive a teammate in a multiplayer match.
Catch a player in a snare trap in multiplayer.
In multiplayer, be the only player on your team that isn't dead or downed.
Complete all conversations with the Endurance crew.
Fully mod and completely upgrade all weapons.
Shoot 10 enemies off zip lines.
Purchase all skills in all categories.
Incapacitate 25 enemies with dodge counter.
Complete the game.
Find all documents, relics and GPS caches.
Complete all challenges.
Fully mod and completely upgrade any weapon.
Complete all optional tombs.
Find 75% of all documents.
Rope pull 5 enemies off edges.
Loot 200 enemies.
Kill 75 enemies with the rifle.
Collect 75% of all relics.
Find 75% of GPS caches.
Kill FeeFee the crab.
Kill and loot 10 flying animals (crows and gulls).
Kill 40 enemies with the shotgun.
Collect 5000 pieces of salvage.
Shoot a bundle of dynamite out of the air.
Kill 25 unaware enemies.
Purchase all skills in one category.
Perform 15 finishers.
Force an enemy to drop dynamite that kills two people when exploding.
Find 25% of GPS caches.
Perform 50 headshot kills in the single player campaign.
Kill 35 enemies with the pistol.
Kill and loot 10 small animals (rabbits, chickens, rats).
Collect 25% of all relics.
Kill 50 enemies with the bow.
Find 25% of all documents.
Complete one optional tomb.
Complete one challenge.
Kill and loot 10 large animals (deer, boar, wolves).