Elex

There are six different skill trees in Elex. Each of them requires 20 Skill points to max out, and you only get one skill point per level up. While there is no level cap in the game, experience from quests tends to run out around 35-40, so it is unlikely you'll max out more than two skills trees naturally. If you want to limit yourself to one playthrough, you're going to need to hold on to as many skill points and attribute points as possible. Also, since you need to choose a faction at the end of Chapter 1, this limits how much you'll gain naturally.

One thing that takes the stress off this task outside of leveling, is finding "Elex Potions" that will grant extra skill/attribute points. Some of their locations can be found here. You'll also need to invest one skill point into the Chemistry skill, as you can turn the weaker Elex potions into the stronger versions, and brew them with Natural Elex and Liquor. The smallest Elex drink one only gives 100xp (useless) while the regular one gives two attribute points (most helpful), and the strongest one gives one skill point (also great).

Now, to actually max out a skill tree, you'll need to have a set amount of attribute points in each of the five attributes (Strength, Dexterity, Cunning, Intelligence, and Constitution). You get 10 attribute points per level, and after you hit 31 points in an attribute, you'll need two attribute points to raise the attribute by one total point; at 61 points it takes a whopping five attribute points to go up one total point. So this is very limited as well. You need a minimum of 40 attribute points in each of the skills no matter what skill you're trying to max, so aim to get all of them to that point with your first 15 or so levels, and then hoard all the points after that. Remember you're also hoarding as many skill points as possible too (though some skills are helpful to purchase along the way for other achievements - lock picking and hacking).

Now, to make this a bit easier to read, before joining any faction at the end of Chapter 1, make sure you have the following:

• 20 skill points saved up
• All your attributes at 40, then all attribute points saved up
• Complete all faction side quests and be able to join all three (but don't)
• Buy a ton of Natural Elex/Liquor and make Elex potions (I made 200 to be safe)

Now you can start saving and reloading to get all six skill trees maxed out. Max out one of the first three skill trees (Combat, Survival, or Crafting) and then reload to get the other two. Now, join a faction (Berserker, Outlaw, or Cleric) and max that faction's skill tree and reload to get the other two. Reload once more, and now you can actually spec your character how you want and join whatever faction you want to be in permanently (check their skill trees for what would benefit your play style).

WARNING: Drinking the Elex Potions (as well as eating Natural Elex) increases your Cold rating. It is a slow process (supposedly every 10 potions increases your Cold by 1 point according to PC players), but you want to avoid doing this until you have the "Human" achievement and corresponding ending achievement ("Pure Rebel"). It is tempting to just max all your skills right away, but you could screw yourself out of those two achievements later on if you drink hundreds of potions and do not have enough dialogue choices in the game to lower your Cold enough afterward.

However, you CAN safely bump your attributes in this manner if you're careful. Once you have made enough emotional choices and unlocked the "Human" achievement, try drinking 10 Elex potions and check your Cold rating. If it didn't change, save your game and drink another 10. Repeat until the rating does change, then reload your last safe save file. The next time you make a choice that results in the "Cold Decreased" message, you should be safe to drink another 10 potions (or more). Doing this will gradually make you more powerful as you go, so the faster you get the "Human" achievement, the faster you can begin to make your character OP.

To get unlimited money by glitching vendors, see this video. Using that money, you can purchase unlimited amounts of Natural Elex and Alcohol from any vendor (upgrading the Camp in the Center to have a vendor is the easiest). Then with the Chemistry skill on your character, you can make unlimited amounts of Elex Potions (upgrade the Camp to have a workbench). See this video for how to buy those ingredients (the stock replenishes every time you speak with the vendor, that isn't a glitch) and how to craft the potions afterward.