Successfully complete the game with the following tasks finished to unlock the corresponding title and number of Title Points. Beat the game, and you can win Titles based on your achievement. Each of these Titles are worth a certain number of points, which you can use to purchase Rewards for your next playthrough.

Blessed (60 Title Points): Finished the Amane route.
Demon Collector (100 Title Points): Registered all generic-fusion demons.
Demon Wrangler (400 Title Points): Registered all possible demons.
Despot (20 Title Points): Finished the Naoya/Kaido 8th day while killing.
Escapee (60 Title Points): Finished the Yuzu route.
Focused (200 Title Points): Finished the game with no free battles.
Ghost Buster (90 Title Points): Thwarted Yomotsu Ikusa's scheme.
Gin's Savior (20 Title Points): Saved Gin in battle.
Haru's Savior (20 Title Points): Prevented Haru's death.
Hell Fighter (120 Title Points): Emerged victorious from Nebiros' challenge.
Keisuke's Savior (20 Title Points): Prevented Keisuke's death.
Mari's Savior (20 Title Points): Prevented Mari's death.
Master (60 Title Points): Finished the Atsuro route.
Messiah (20 Title Points): Finished the Amane route's 8th day.
Muckraker (20 Title Points): Discovered the government's secret weapon.
Overlord (60 Title Points): Finished the Naoya/Kaido route.
Peacemaker (20 Title Points): Finished the Yuzu route's 8th day.
Prize Winner (30 Title Points): Emerged victorious from Ghost Q's challenge.
Reinforcer (20 Title Points): Strengthened the barrier on Yuzu's 8th day.
Skillful (150 Title Points): Cracked all possible skills.
Sleepwalker (60 Title Points): Saved the Sage of Time's Victims.
Star Destroyer (200 Title Points): Emerged victorious from Lucifer's challenge.
Survivor (70 Title Points): Finished the game once.
Unkillable (200 Title Points): Finished the game without any deaths.
Vanquisher (60 Title Points): Finished the Gin route.
Warlord (20 Title Points): Finished the Naoya/Kaido 8th day without killing.