To play as Mami, at the character selection screen while producing a new unit, click Ami's photograph using the Right Analog-stick. To play as Shot-haired Miki, click Miki's photograph using the Right Analog-stick.

Allow the game to idle at the main menu until a hidden sequence starts.

ACHIEVEMENT - HOW TO UNLOCK
10 Idols (30) - Play the game with all 10 girls
16 Songs (30) - Play the game with all 16 included songs
Excited 01 Taiyou no Jealousy (20) - Get a voltage of 90% or higher on "Taiyou no Jealousy"
Excited 02 Here we go!! (20) - Get a voltage of 90% or higher on "Here we go!!""
Excited 03 Ohayou!! Asagohan (20) - Get a voltage of 90% or higher on "Ohayou!! Asagohan"
Excited 04 9:02pm (20) - Get a voltage of 90% or higher on "9:02pm"
Excited 05 THE IDOLM@STER (20) - Get a voltage of 90% or higher on "THE IDOLM@STER"
Excited 06 Massugu (20) - Get a voltage of 90% or higher on "Massugu"
Excited 07 relations (20) - Get a voltage of 90% or higher on "relations"
Excited 08 Omoide wo Arigatou (20) - Get a voltage of 90% or higher on "Omoide wo Arigatou"
Excited 09 Positive! (20) - Get a voltage of 90% or higher on "Positive!"
Excited 10 Mahou wo Kakete! (20) - Get a voltage of 90% or higher on "Mahou wo Kakete!"
Excited 11 First Stage (20) - Get a voltage of 90% or higher on "First Stage"
Excited 12 Aoi Tori (20) - Get a voltage of 90% or higher on "Aoi Tori"
Excited 13 Agent Yoru wo Yuku (20) - Get a voltage of 90% or higher on "Agent Yoru wo Yuku"
Excited 14 My Best Friend (20) - Get a voltage of 90% or higher on "My Best Friend"
Excited 15 GO MY WAY!! (20) - Get a voltage of 90% or higher on "GO MY WAY!!"
Excited 16 Watashi wa Idol (20) - Get a voltage of 90% or higher on "Watashi wa Idol"
Favorite Song 01 Taiyou no Jealousy (20) - Choose the song "Taiyou no Jealousy" 5 times
Favorite Song 02 (Here we go!!) 20 - Complete "Here we go!!" 5 times.
Favorite Song 03 (Good Morning! Breakfast) 20 - Complete "Good morning! Breakfast" 5 times.
Favorite Song 04 (9:02 pm) 20 - Complete "9:02 pm" 5 times.
Favorite Song 05 (THE IDOLM@STER) 20 - Complete "THE IDOLM@STER" 5 times.
Favorite Song 06 (straight) 20 - Complete "Straight" 5 times.
Favorite Song 07 (relations) 20 - Complete "Relations" 5 times.
Favorite Song 08 (Thanks for the memories) 20 - Complete "Thanks for the Memories" 5 times.
Favorite Song 09 (positive!) 20 - Complete "Positive" 5 times.
Favorite Song 10 (over the magic!) 20 - Complete "Over the magic!" 5 times.
Favorite Song 11 (First Stage) 20 - Complete "First Stage" 5 times.
Favorite Song 12 (Blue Bird) 20 - Complete "Blue Bird" 5 times.
Favorite Song 13 (Agents pass away the night) 20 - Complete "Agents pass away the night," 5 times.
Favorite Song 14 (My Best Friend) 20 - Complete "My Best Friend" 5 times.
Favorite Song 15 (GO MY WAY!!) 20 - Complete "GO MY WAY!!" 5 times.
Favorite Song 16 (I am idle) 20 - Complete "I am idle" 5 times
Full combo (30) - Complete a song in cheering mode without missing a beat
Item complete (30) - Receive all basic items (clothes and accessories) from the company president

To view a hidden introduction sequence, remain idle at the main menu. It will eventually start playing.