To change your character's appearance in Oblivion, you'll need to use a console command, which will disable achievements.

Oblivion remastered was developed by Bethesda Game Studios and Virtuos. Controversies arose over pricing and paid content, ...

A word of caution: selecting only the best weapons in The Elder Scrolls IV: Oblivion Remastered is not enough; you need to equip yourself with suitable armor as well. On that note, scroll away to go ...