Most of these exploits only work at the start of the game when Lara first reaches the Wilderness area.
Maximum exotic, antler, hide exploit. When Lara first hunts, the sequence shoot a deer, loot hide and optionally antler, followed by reload checkpoint without going to a camp will reset ammo but keep the hide. For the male deer with two sources exotic and antler or hide and antler, as long as either of the sources is not at game max, the other source can be increased beyond the game max.
Maximum herbs and cloth. After the first bear encounter and fall, and after collecting herbs and cloth, when the game prompts for heal, use reload checkpoint which retains current herb and cloth inventory, but restarts the collection sequence, which allows Lara to collect the max count herbs and cloth.
After the first bear encounter and Laras fall, if Lara does not collect 3 mushrooms, she can continue hunting and using the camp.
Unlimited XP, but its slow. After collecting the 3 mushrooms, going to camp and forced to craft poison arrows, Lara goes to sleep and then wakes up to trinity soldiers in the area. Lara can kill all but 1 soldier, go back to camp, use and exit camp, reload checkpoint and repeat the sequence again. Its fastest to leave the 2 soldiers near the path to the bear cave and do 5 soldiers at a time. Using stealth attack, Lara gets 125 XP for the 5 soliders, and with finess skill 175 XP for each cycle. It would take about 16 hours to collect all skill points this way, so using the trainer to increase XP would be more reasonable. Another spot is at the train yard, from the train yard camp, go back through the train yard to the landing area to get 75 XP for stealthy, which is supposed to be for using the zip line, but just going to that area triggers 75 XP, then back to camp. Repeat as desired.
The other main reload checkpoint exploit is for challenges that require ammo. Doing a reload checkpoint will restore ammo, but retain the challenge count.
[Edited by rcgldr, 2/17/2018 2:32:14 AM]