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