The Psycho Krieg and the Fantastic Fustercluck Add-on for Borderlands 3 has 7 achievements.
Open the gates to Vaulthalla.
Defeat Psychoreaver.
Complete all side missions and crew challenges in Krieg's Mind.
Defeat Dr. Benedict.
Defeat Locomöbius.
Defeat Evil Lilith.
Complete mission “Enter the Psychoscape”.