The Psycho Krieg and the Fantastic Fustercluck Add-on for Borderlands 3 has 7 achievements worth 190 gamerscore.
Explore all of Vaulthalla.
Defeat Psychoreaver.
Defeat Dr. Benedict.
Complete all side missions and crew challenges in Krieg's Mind.
Defeat Locomöbius.
Defeat Evil Lilith.
Complete mission "Enter the Psychoscape".