Metal Slug 3

Easily done on the first mission, can be done in Single Player or Xbox LIVE Co-op. Co-op with a friend would be a great idea as you can just hang back and let your friend collect any weapons.

NOTE: Guds Storm said - "Can not be done in offline (local) co-op."

The weapons you can pick up on this mission are:

Heavy Machine Gun [H] x4
Super Grenade [G] x1
Enemy Chaser [C] x1
Dropshot [D] x1
Iron Lizard [I] x1

You can easily jump over the powerups you come across but if you do accidentally pick up a powerup you will need to start the level again.

You can however still use the Slugnoid to aid you in finishing off the boss at the end of the level, this is not a powerup item it is just a vehicle so your achievement will still unlock at the end of the mission.

Also dont worry about picking up Bombs, this is just ammo for your standard bombs so this wont effect your achievement either.

The video shows you the locations of the 1^st three Powerups but after them the video takes the route onto the small ship after dropping down a small gap. My guide will cover the route which takes you into the large ship after jumping over the gap and getting into the silver lift.

1^st Powerup: Heavy Machine Gun

(0.55) The first captured POW drops a Heavy Machine Gun after you free and walk into him.

2^nd Powerup: Super Grenade

(1.13) Madoka Aikawa drops the Super Grenade from her backpack if you shoot or walk into the backpack. Just try to jump over her to avoid picking the powerup by accident.

3^rd Powerup: Heavy Machine Gun

(1.33) A POW tied to a post drops it after you free and walk into him.

After skipping the 3^rd Powerup jump over the gap you will come to instead of going lower and taking the boat with the POW tied up on it. The powerups in this section can be avoided by just jumping from box to box.

4^th Powerup: Heavy Machine Gun

Inside of the ship, the first large Red Lobster (Ohumein-Conga) drops the Machine Gun once you kill it.

5^th Powerup: Enemy Chaser

This is dropped off of an enemy just after you see the small cage with Utan locked up in.

6^th and 7^th Powerup: Iron Lizard and Dropshot

These two powerups come at almost the same time after you kill the two Red Lobsters that appear one after the other.

8^th Powerup: Heavy Machine Gun

This powerup is dropped from a POW whilst you are fighting the boss, but the times it appears can be random. If you finish off the boss fast enough the POW may not appear, but if you are really unlucky he will appear as you have killed the boss and you wont be able to move.

So hopefully this should help, you can always try it on another mission if need be. Finish off the mission with your standard Pistol and Grenades and not having picked up any Powerups and the achievement is yours.

(Credit to 010101Eddy101010 for the first video)

Here a Video , to become this achievement :)
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