Here is the full list of all 34 Parry Nightmare achievements.
Complete with over 1,000 Parries
Complete without touching a single Trauma
Complete with over 1,000 Traumas defeated
Complete First Nightmare
Complete First Nightmare within 5 minutes
Complete First Nightmare without a single failed Parry
Complete First Nightmare without Honnou getting knocked down
Complete First Nightmare with over 1,000 successful Parries in a row
Complete Work Nightmare
Complete Work Nightmare within 5 minutes
Complete Work Nightmare without a single failed Parry
Complete Work Nightmare without Honnou getting knocked down
Complete Work Nightmare with 1,000 successful Parries in a row
Defeat over 10 Bosses and complete Work Nightmare
Use Burst of Excitement over 15 times before completing
Complete School Nightmare
Complete School Nightmare within 5 minutes
Complete School Nightmare without a single failed Parry
Complete School Nightmare without Honnou getting knocked down
Complete School Nightmare with over 1,000 successful Parries in a row
Defeat over 10 Bosses and complete Nightmare at School
Complete Childhood Nightmare
Complete Childhood Nightmare within 5 minutes
Complete Childhood Nightmare without a single failed Parry
Complete Childhood Nightmare without Honnou getting knocked down
Complete Childhood Nightmare with over 1,000 successful Parries in a row
Defeat over 10 Bosses and complete Childhood Nightmare
Complete with Honnou's form after she eats sushi
Complete all Nightmares with Honnou's form after she eats sushi
Complete with Honnou's form after she eats meat
Complete with Honnou's form after she eats vegetables
Complete with Honnou's form when she eats nothing
Complete all Nightmares
Achieve all Completion Ranks for all Nightmares