Tomb Raider Skill Trees: Survivor

When it comes to unlocking skills, you need to have Lara level up and invest into the different trees. As she gains skills she will unlock higher ranking skills. The break down is as follows:
Rookie – No Other Skills
Hardened – 7 Skills
Specialist – 14 Skills

These skills focus on Lara's ability to find more items and rewarding her for the effort involved. Early on they are helpful for a stealthier approach or for those times when you simply need more Salvage. They are also very helpful in finding collectibles and ensuring Lara can search the Island with greater freedom.

Skill Name: Requisites
Description

Animal Instincts: Rookie
Keen observation allows you to spot hard-to-find animals and food sources. Press the Survival Instinct Button to see animals and food glow.

Survivalist: Rookie
Earn extra XP when looting animal corpses and food caches. Grab this early to accelerate the rate you earn skills.

Advanced Salvaging: Rookie
Thoroughly search crates and caches to find more salvage. Great to build up supplies early.

Bone Collector: Rookie
Carefully looting animal corpses gives you more salvage.

Arrow Retrieval: Rookie
Recovers arrows from the bodies of enemies and prey. Loot the bodies to retrieve the arrows.

Scavenging: Rookie, Arrow Retrieval
Spotting hidden pockets on enemy corpses to gain extra ammunition.

Climber's Agility: Hardened
Increase your climbing skills to traverse  the environment with greater agility and resist falling damage. Press the Dodge  button as landing from a high fall to reduce damage. A high enough fall can still kill Lara.

Orienteering: Hardened
use your keen perception to find hidden rewards in the environment. Use Survival Instincts to look through walls for collectibles. You can still Waypoint these items and then use the Beacon to get there.

Cartography: Specialist, Orienteering
Examine your map carefully to reveal Hidden Tombs and secrets scattered all over the Island.