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