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