I got this achievement right after knocking out the first guard. It looks like a speech bubble to the left of the second guard. Click it in order to read. See screenshots below.

Easy method contrubted by Loki:

Originally posted by Loki:

"Back to bed with you" can also be easily obtained by throwing a toxic smoke bomb at an enemy, waiting for them to get revived, and then throwing another one at the same enemy. Please note this in your guide.

This achievement is very simple. It can be done in 3 steps. Just make sure that there are at least 2 guards in close proximity to each other.

Step 1: Knock out Guard #1
Step 2: Drop the body in such a way as to alert Guard #2 that Guard #1 has been knocked out. This will trigger Guard #2 to wake up Guard #1.
Step 3: Once Guard #1 has been woken up. Wait for an opening to knock him out again.

For the sake of saving time, I did this achievement near the very beginning. See screenshots below.

Self-explanatory. You simply have to complete the special edition level. It will involve maneuvering through traps but it doesn't really deviate from what you've already conquered in the past.

Please watch the video. It's done in the same level as Cordyceps (Level 8 - Hessian Castle - A Blade at His Neck).

http://www.youtube.com/watch?v=yGfykReTyJ0

Self-explanatory once again. I completed this achievement using the first level of the game. You don't have to score high or anything to unlock it so feel free to rush through if that is to your liking.

This is done very close to the beginning of Level 8 (Hessian Castle - A Blade at his Neck). It's very easy.

http://www.youtube.com/watch?v=wu-iUHR0gjY

Another easy achievement. You can find one of the history developer commentaries in the level 'A Change in Course' in Oshi City. Click the first bubble you find. See screenshots below.

In case you have forgotten, spotlights are the lights that you cannot break with your kunai. Dusk Moths are unlocked for the main story once you play through Dosan's story. Simply target the spotlight with the Dusk Moths as shown in the screenshots below.