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