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