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