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With the points you have earned from Achievements/Titles, you can buy the rewards listed below. Those that increase in quantity, such as the carry over demon and compendium rewards have to be gained in succession:
10% off Compendium - 40 Points
30% off Compendium - 120 Points
50% off Compendium - 200 Points
Carry over 1 demon - 10 Points
Carry over 4 demons - 60 Points
Carry over 8 demons - 180 Points
Carry over all demons - 300 Points
Carry over auction - 40 Points
Carry over Macca - 110 Points
Carry over skills - 10 Points
Fallen Star - 100 Points
Remove EXP limit - 60 Points
Remove fusion LV limit - 70 Points
Bundled with Devil Survivor Overclocked are a set of achievements that you can get having completed the game once. These get you points which you can use to redeem rewards. Below is the full list:
Blessed - 60 Points - Finished the Amane route.
Demon Collector - 100 Points - Registered all generic-fusion demons.
Demon Wrangler - 400 Points - Registered all possible demons.
Despot - 20 Points - Finished the Naoya/Kaido 8th day while killing.
Escapee - 60 Points - Finished the Yuzu route.
Focused - 200 Points - Finished the game with no free battles.
Ghost Buster - 90 Points - Thwarted Yomotsu Ikusa's scheme.
Gin's Savior - 20 Points - Saved Gin in battle.
Haru's Savior - 20 Points - Prevented Haru's death.
Hell Fighter - 120 Points - Emerged victorious from Nebiros' challenge.
Keisuke's Savior - 20 Points - Prevented Keisuke's death.
Mari's Savior - 20 Points - Prevented Mari's death.
Master - 60 Points - Finished the Atsuro route.
Messiah - 20 Points - Finished the Amane route's 8th day.
Muckraker - 20 Points - Discovered the government's secret weapon.
Overlord - 60 Points - Finished the Naoya/Kaido route.
Peacemaker - 20 Points - Finished the Yuzu route's 8th day.
Prize Winner - 30 Points - Emerged victorious from Ghost Q's challenge.
Reinforcer - 20 Points - Strengthened the barrier on Yuzu's 8th day.
Skillful - 150 Points - Cracked all possible skills.
Sleepwalker - 60 Points - Saved the Sage of Time's Victims.
Star Destroyer - 200 Points - Emerged victorious from Lucifer's challenge.
Survivor - 70 Points - Finished the game once.
Unkillable - 200 Points - Finished the game without any deaths.
Vanquisher - 60 Points - Finished the Gin route.
Warlord - 20 Points - Finished the Naoya/Kaido 8th day without killing.