Kane & Lynch: Dead Men

While the exact number is yet unknown, once you toss back enough grenades (frag or teargas), the Achievement will unlock. From my experience I would guess it's somewhere around 25-30, though I did not keep exact count.

In the Breakout Chapter, once you reach the prison yard you will find a lot of teargas grenades being tossed your way. Run around from cover to cover and toss them with the A button when you're prompted (standing on top of them). You don't have to toss it back, you can pitch it against a nearby wall and recover it again for faster tallying.

Feel free to drop the game down to Aspirin difficulty level, as it does not affect the Achievement.

The other solutions are good but this might be the fastest:

- Go to the map Tokyo Streets (Chapter 10 in Campaign).
- You'll start off in an elevator.
- Get down the stairs - The police will throw some teargas grenades in.
- Throw all of em back (4-6).
- Restart scene.

Took me 4 restarts to get the achievement.

- On the map tonkyo in the stairway near the bus. teargas or grenades.
- Reset the scene.
- 20 releases.
- The achievement on the screen.

This can be obtained on the first level, although there are faster solutions mentioned in the other guides. This is still pretty quick though if you haven’t unlocked the other levels.

Load up Impact on Aspirin difficulty and progress a couple minutes through the level until you reach the junkyard where the helicopter is shooting down at you from above.

At this point, your allies will throw 1-2 smoke grenades for you to use as cover. Walk up to each grenade and press to throw them back.

It won't count more than once for each grenade, so press and restart the scene. Repeat this process until you’ve thrown back 20 grenades and you should unlock the achievement.