Mutant Year Zero: Road to Eden

As Admiral Blunts states in his/her solution, there isn't enough points to do both your mutations and stats, however, provided you are meticulous and kill every enemy in the game, you can easily afford all stats except the final one, so don't worry about buying stats early to help you make progress through the game.

Killing all enemies may sound daunting, but there are usually only 2 or 3 groups in each area and the areas are quite small, so finding them is easy. You can also, and should, avoid some fights and come back to them when properly prepared. All areas can be re-visited, so you won't lock yourself out at any point.

When I finished the game I was level 75, which is approximately how many skill points you will receive, although you get a few less for the 3 additional characters you find throughout the game. Fear not, though, as you will still have enough points to buy the first 4 stats for every character and all mutations if you kill everything. In fact, you could even do so if you only level into the high 60s.

Finally, you can still purchase mutations after the final boss fight, so if you're short one or two, that fight should give you the necessary points.

Finally, finally, all characters earn the same amount of points whether or not you use them, so you only need to go the Ark switch an unused character into the squad and purchase their mutations, then you can switch them out again if you don't want to use them.

Just an FYI before going for this, you will not have enough skill points if you upgrade the right path (HP up, move distance, grenade throw distance, etc) So unlock all of the mutations before going after the right tree.

I just finished the game, having killed every single enemy,and was missing about 15 skill points to unlock all of the mutations.