Alternate character appearance
At the character selection screen, press A to select a character, then press X, Y, or Start. Press A to start the match with the alternate appearance. Not all characters have an alternate version.

Biolab Core stage
Complete Story mode.

Bonus system announcer voices
In the options menu, you can choose different voices for the system announcer. To unlock additional voices, enter Sparring mode and bring up the sparring menu. Select Exercise and you will be prompted to run through an extensive moves list.

Complete the moves list to unlock that character's voice as a system announcer. Complete Exercise mode with all default and bonus characters to unlock Alpha-152's system voice.

Gamerscore points
Accomplish the indicated task to get the corresponding number of Gamerscore points:

Achieve a Bronze Star (10 points): Defeat someone with a 10-14 win streak in Dead Or Alive 4 Online.
Achieve a Gold Star (30 points): Defeat someone with a 20+ win streak in Dead Or Alive 4 Online.
Achieve a Silver Star (20 points): Defeat someone with a 15-19 win streak in Dead Or Alive 4 Online.
Unlock Ein (10 points): Complete Story mode with Hitomi.
Unlock Gen Fu (10 points): Complete Story mode with Eliot.
Unlock Helena (20 points): Complete Story mode with all characters.
Unlock Leon (10 points): Complete Story mode with Zack.
Unlock Spartan-458 (20 points): Complete Story mode with Helena.
Unlock Tengu (20 points): Complete Time Attack mode with all default and hidden characters.

The following are secret achievements, but will earn no Gamerscore points:

Get a D rank in Dead Or Alive 4 Online.
Get an E rank in Dead Or Alive 4 Online.
Get an F rank in Dead Or Alive 4 Online.
Lose 5 consecutive online matches.
Lose 10 consecutive online matches.
Lost 20 consecutive online matches.

Halo reference in the game
Select Spartan-458 and play on the Gambler's Paradise stage. During the match, a Warthog with Marines will appear on the road.

Hidden goof rewards
Some of the game's secrets shown in the achievements list are actually goof rewards. These vary from Loss Streaks to Rank Demoting. Useless, but mildly interesting.

Nassau Station stage
Complete Story mode with Helena.

Play as Ein
Complete Story mode with Hitomi.

Play as Gen Fu
Complete Story mode with Eliot.

Play as Helena
Complete Story mode with all sixteen characters.

Play as Leon
Complete Story mode with Zack.

Play as Spartan-458
Complete Story mode with Helena.

Play as Tengu
Complete Time Attack mode with all default and hidden characters.

Tatami Mat stage
Unlock all costumes and system voices and Complete Story mode with all seventeen characters.

Theater mode
Complete Story mode with any character.

Alternate costumes
Complete Story mode to unlock an alternate costume with the following characters. If available, the next alternate costume for that character will be unlocked when Story mode is completed with them again.

Ayane C3, C4, C5, C6
Bass C3, C4
Bayman C3
Brad Wong C3
Christie C3, C4
Elliot C3, C4
Hayabusa C3, C4
Hayate C3, C4
Helena C3, C4 C5
Hitomi C3, C4, C5, C6, C7, C8
Jann Lee C3, C4
Kasumi C3, C4, C5, C6, C7
Kokoro C3, C4, C5, C6, C7
La Mariposa C3, C4, C5
Leifang C3, C4, C5, C6, C7
Tina C3, C4, C5
Zack C3, C4

Complete Time Attack mode on the default settings to unlock an alternate costume with the following characters. If available, the next alternate costume for that character will be unlocked when Time Attack mode is completed with them again.

Ein C3, C4
Genfu C3, C4
Leon C3, C4
Spartan-458 C3, C4, C5, C6, C7

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