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