Yaris

To unlock this achievement, as it says, you must collect all weapons at least once before you exit.

You can quit out to the main menu just don't exit to dashboard or turn the console off. You also do not need all the upgraded weapon slots either. You just have to collect the weapons not use/store them.

While not required, I am going to suggest purchasing an upgrade to your weapon slot. Some people are having issues unlocking this achievement without it.

There are two methods in getting this achievement and two different tracks.

If you are just going for this achievement I would suggest track one. Reason being is it drops all the weapons, less danger, and is the quickest track.

If you are boosting or will boost for the 1 million coins go ahead and repeat track 5.

In order to get weapons all you do is kill the ripoff iPod looking enemies. They never drop any coins however once in a while they will drop weapons. Just run over the newly dropped weapon and you will obtain it.

Finish the race and if you did not get the achievement re-play the track and try again.

The above solution worked for me, but I just wanna add some to the solution. And that is a list of the weapons and how you can recognize them.

Weapon inventory is at bottom-left of the screen, next to your shield and radar.

5 weapons (excluding the stock gun):
- Gauss Gun (shoots a blue ball of energy/plasma/thingy)
- Gattling Gun (shoots yellow things, automatic, blue colored in your weapon inventory)
- Rocket Launcher (shoots, well, rockets, red colored in your weapon inventory)
- Sawblade Launcher (shoots discs, lightblue colored in your weapon inventory)
- Shotgun Laser (shoots a spread of 3 slugs, yellow colored in your weapon inventory)

2 Special Weapons (one at the time in inventory):
- Shield Discharge (a radar-logo above your weapon inventory, activated with LT, damage also own shield)
- Sonic Blast (number 5-logo above your weapon inventory, you can use it 5 times, activated with LT)