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