When you create a custom character, you can obtain max stats (however, the game plays with you for doing that, so doing the 'MAX STAT" achievements are a little more difficult).
You make a custom character, choose the options that'll get you max stats. The game will even comment on your stats. After that, just go through things like normal. What will happen after is that your stats get randomized every time you enter a different area. While your stats don't show being max, it's basically a "Max Stats" mode that makes things a little trickier.