Warhammer 40k - Fire Warrior

Hints:
------
Submitted by: rickHH

Easy Dreadnaught kill:
----------------------
Walk directly up to a Dreadnaught so that you are touching it. 
Shoot its guns and then his chest. Be careful because it will explode.

Hard mode:
----------
Successfully complete the game under the normal difficulty setting to
unlock the hard difficulty setting.

Level select:
-------------
Successfully complete the game to unlock all levels under the same
difficulty setting initially used.

Unlimited shield:
-----------------
Successfully complete each level (including the training level) under
the hard difficulty setting.

Unlimited ammunition:
---------------------
Successfully complete the game under the normal difficulty setting
with an "A" rank on each level (including the training level).

Unlimited grenades:
-------------------
Successfully complete the game under the hard difficulty setting with
at least a "B" rank on each level (including the training level).

Unlimited health:
-----------------
Successfully complete the game under the hard difficulty setting with
at least a "C" rank on each level (including the training level).

Selectable left-weapon:
-----------------------
Successfully complete the game under the hard difficulty setting with
an "A" rank on each level (including the training level).