UPDATE: The following fix is not working. The game crashes each time the player gets a new Steam achievement.

If your game is being crashed continuously, you should try disabling “Steam Overlay”:

1 Launch Steam and click on the "Settings" button. Click on the "In-Game Settings" tab.

2 Uncheck the box next to "Enable Steam Community In-Game" and click OK.


3 Disable the Steam Overlay on specific games only by right-clicking on the game title, click on "Properties" and uncheck "Enable Steam Community In-Game" in the "General" tab.

Source: http://www.ehow.com/how_10004514_disable-steam-overlay.html

There will be a master reset prior to the official launch, so everyone will loose their beta progress. Don't get attached to any perk or upgrade.

Official: "PAYDAY 2 will be out on Steam on August 13th. The other platforms will follow suit and be out between the 13th and the 16th."