Maximum Health is a Survival upgrade that gives Joel a bigger health bar, in two levels. Like every Survival upgrade, you pay for it with supplements, the pill bottles and plants you scavenge throughout the campaign.
There are none in Hometown or The Quarantine Zone; the first ones turn up in The Outskirts. Their locations and amounts are the same on every difficulty, so a thorough first run plus New Game Plus can max everything.
Crafting Speed
Cuts the time Joel takes to craft items from his backpack.
Healing Speed
Lets Joel apply health kits faster.
Listen Mode Distance
Widens the radius in which Listen Mode reveals enemies through walls.
Shiv Master
Level 1 lets Joel stab a clicker that grabs him if he has a shiv. Level 2 stops a full-durability shiv from breaking when used this way.