In the second part of stage 1, Abobo (the giant) has to fall into the pit.

In the last part of stage 2, Williams is looking into the hole ... knock he in.

Stun and grab two enemies at once.

Upgrade (for the first time) a single song at the Tapesmith.

In co-op mode, catch a boomerang thrown by your parner.
Simply stand in front of the return trajectory. No need to press any buttons.

At the plant boss (stage 8) don't kill a single bulb first, but expose the twin bulbs simultaneously.

Collect one of each mix tape song.

Grab an enemy out of the air 10 times.
Just after an uppercut, quickly press the grab button to pick he/her up in the air.

Complete the game at any difficult level.

In the first battle on level 2, hit Skullmageddon with a hair pick.
You can find it just before the boss, breaking a garbage pail.
Note: For the correct hit, the hair pick must remain on the Skullmageddon's head.

Dodge and get the Gleam 50 times.

Grab and use every weapon at least once.

View all pages of the concept art gallery.
It unlock by finishing the game on any difficulty level.

Break all of the Skullmageddon monitors in the Rocket Dojo.
The Rocket Dojo is on stage 3 and 4.

Is pretty simple, there are only 3 monitors that require different actions:

1. Stage 3 - The screen is in the low










Select the "bomb toss" sosetsitsu










And launch the bomb near the monitor to destroy it.










2. Stage 3 - The screen is inaccessible for kicks and punches.
You simply need to remember to pick up a weapon to be able to launch, or use fireball sosetsitsu twice.










3. Stage 4 - The screen is inaccessible for kicks and punches.
You simply need to remember to pick up a weapon to be able to launch.
Throw the key is not enough to break the monitor.

In stage 6, arrive up to this point:










Go in the middle of the two stones and dodge repeatedly.










Fuzzface will appear and you will got your achievement.

Max out a single song to level 50.

Defeat (not stun) an enemy using a key as last hit.
Tip by Energy Melons: For some reason this achievement does not trigger on Ichisumi, nor Hoverbizzle type enemies. Try with Williams or Linda.

Reach $ 50,000 or more (not in total, but you must have $ 50,000 or more without spend it).

At begin of stage 7, break the glass first, then hit the punching exactly 87 times, no more and no less.










Stop and wait, you will hear a sound and you will pass into another section.










Beat this section and got the achievement.

In stage 4, win one airlock battle without a single attack and without fall out of the airlock.

Complete any level without taking any damage.

Complete the game (at any difficulty level) without using any Sosetsitsu.
Using stances is allowed.

Beat every stage as a Ro-bro.
To activate the Ro-bro mode, go on in-game options.

Finish every stage in singleplayer on Double Dragon difficulty.

Defeat 4 enemies with a single bat swing.
Note: You must use only the baseball bat.
Tip: A perfect spot where you can try this, is to Stage 1 above the rooftops.

Max out all the 20 songs (10+10) to level 50.

Complete any level in co-op without taking any damage, with friendly fire enabled.
Note: To get this achievement, both players must not be damaged.
Tip: stage 1 normal is recommended.

Nail all enemies with the hair pick.
Note: For the correct hit, the hair pick must remain on the enemy's head.

These are the enemies to hit (thanks to Gea Force and KoMiKoZa):

* Williams (also different skins)
* Linda (also different skins)
* Abobo
* Skullmageddon (on first battle at stage 2)
* Shun (also different skins)
* Roxy
* Mecha Biker (stage 4 boss)
* Boa Boshi
* Skeleton samurai
* Jiang Shi
* Ichisumi
* Hoverbizzle

You don't need to hit skeleton versions of enemies.

Finish every stage cooperatively on Double Dragon difficulty with friendly fire enabled.
Note: on stage 10, just win the first battle ("normal" Skullmageddon) to get this achievement.