On an alternate save I made a party of just the game developers in order to go after the "Indecisive Person" achievement. Even though I didn't play that save, the achievement still popped for me once I completed the main quest.
After gaining the option to play as the developers, which is story based and receiving the "Say Hi to the Game Devs" achievement, use an empty save to create a party of five using each developer. Once created go back to the save you were already playing and keep progressing the story. After beating Morderlagger with a party around level 40 I was able to get this achievement. The developer party never adventured.
For reference the characters are: Betu, Gui, Hugo, Ronaldo, and Saulo.