acheivements and unlockables

Side part of the development of the game:
First of all , should we add acheivments and unlockables , would it be too much work to do?

Ideas about any unlockables acheivements , i could do the logo's all i need is someone to work out the system for the acheivments (im a noob gml'er).

OK, I can help.

ok , use the engine that we currently have the mk 001 , then try an make an acheivement engine , think of some acheivements & unlockables to do.
heres some:
-Captured machine gun
-Finished mission 1
-Finished mission 2
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Acheivments
===================
unlockables
VVVVVVVVVVVVVVVVV
-high cal
- double bullets
-fire bullets
- red dot
-ninja (mission 1:dont see you on a radar or somthing)

These are only a few though try some yourself im doing the sprites, i dont know what style.
Should we have xbox style?
http://www.aeropause.com/wordpress/archives/images/2008/08/77b6a636a049.jpg
or our own style?

Our own No way we rip off the X-BoX's R-Tarded system.

On a side note:
Sad about our inactivity

ok, ill try , whatdya mean , about the inactivity?