Achievements
Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
"R.A.D." Master ( 25 points )	Complete Single Player Arcade Mode without continues using R.A.D.
30 Second Max Bonus ( 15 points )	Maintain the max bonus for 30 seconds or more.
Cleared Stage 1 ( 10 points )	Clear Stage 1 in Single Player Arcade Mode.
Cleared Stage 2 ( 10 points )	Clear Stage 2 in Single Player Arcade Mode.
Cleared Stage 3 ( 10 points )	Clear Stage 3 in Single Player Arcade Mode.
Cleared Stage 4 ( 10 points )	Clear Stage 4 in Single Player Arcade Mode.
Don't Let Me Go ( 15 points )	Hold onto an enemy for 10 seconds or longer with the anchor using Ruby.
Incredible Restraint ( 15 points )	Go 30 seconds without swinging Sensei's sword.
Ruby Master ( 25 points )	Complete Single Player Arcade Mode without continues using Ruby.
Sensei Master ( 25 points )	Complete Single Player Arcade Mode without continues using Sensei.
Tempest Master ( 25 points )	Complete Single Player Arcade Mode without continues using Tempest.
Untouchable ( 15 points )	Repel 20 or more enemy bullets using Tempest.

Extras
There are a number of unlockables after satisfying game conditions. These can be unlocked by continuing, and I'm not sure if you need to finish the game using the same character throughout but it's the safest choice.

Effect	How to unlock
5 credits	Play for 60 minutes total
8 credits	Play for 180 minutes total
Arcade Mode ++	Complete Arcade Mode
Challenge Mode	Complete Arcade Mode
Challenge Mode ++	Complete Arcade Mode
Character - R.A.D	Complete Arcade Mode using Ruby
Character - Sensei	Complete Arcade Mode using Tempest
Extra Credits	As gameplay time elapses. 5 credits at 60 minutes
Female System Voice	Complete Arcade Mode using R.A.D
Retro Mode	Complete Arcade Mode using Sensei
Unlimited credits	Play for 300 minutes total

More Credits
You can unlock more credits to play with simply by playing the game for certain periods of time. For instance, playing for sixty minutes will get you five additional credits, while getting your total playtime up to five hours will unlock an unlimited amount of credits for you to use.

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