Here is the full list of all 16 Akihabara - there are Feel the Rhythm achievements.
Perfect all tracks in Pure Beat mode
Get a collected score of at least 4 000 000
Complete on turbo speed on normal difficulty
Complete the campaign on turbo speed on hard difficulty and get a score greater than 20 000
Complete the campaign on hard difficulty
Complete the campaign on hard difficulty without activating the super charge
Complete the Campaign
Complete the campaign without using a continue
Complete the campaign on normal difficulty and get at least 400 perfect
Complete the campaign on normal difficulty and get no more than 50 bad
Have a total playtime of at least 5 hours
Get a high score of at least 400 000
Have a score multiplier of 25 for 2 minutes on hard difficulty
Get a high score of at least 200 000
Have a score multiplier of 25 for 2 minutes on normal difficulty
Get a score of at least 40 000 on one song