Did you try to use the Search -function before posting?
The complete list of stat upgrades is listed in this
FAQ thread.
But here is the list again, for faster reference and as the thread contains some heavy spoilers

- STR: +6 (+1 Surgery, +1 Perk, +4 Armour)
- INT: +3 (+1 Surgery, +1 Perk, +1 Weird Brain Alignment)
- LUCK: +3 (+1 Perk, +2/+1 Weird Brain Alignment)
- AGI: +1 (Perk)
- END: +1 (Perk)
- CHA: +3 (+1 Perk, +1 Surgery, +1 Shades)
- PE: +2 (+1 Perk, +1 Surgery
The only method I haven't been able to refind (but in the past I have) is the "Weird Brain Alignment".
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"As we all know, holy men has born during Christmas...
Like mr. Holopainen over there!"
- Marco Hietala, the bass player of Nightwish