AREA 4 中ボス ライコウを撃墜した。（Novice・Xbox 360モードのみ）
Destroy the Stage 4 mid-boss "Raiko".
(Can be unlocked in NOVICE mode)
The mid-boss that the game is referring to is the mid-bosses you VS when in ROUTE B; every level has a mid-boss (2 mid-bosses on stage 5) and most of them are challenging. to earn the achievement you must first enter the secret ROUTE on stage 1; entering the secret route on stage 1 is more efficient as you can unlock all "mid-boss" achievements in 1 playthrough.
To enter the stage 1 secret route you must meet 3 requirements before the mid-boss of stage 1. These requirements are as follows:
- Destroy 3 (or more) "silos" before the oncoming tanks crush them.
- Have a full hyper bar upon destruction of the third silo.
- Do not die.
If all requirements are met you will enter the secret route and will be able to vs the mid-bosses. Upon killing the mid-boss of a stage you will unlock the respective mid-boss achievement for that stage. Also a warning, if you continue or die on a mid-boss, you'll be thrown out of ROUTE B and back into ROUTE A. Therefore you can no longer vs the specific mid-bosses and you will then be forced to restart your playthrough.