Complete the indicated task to unlock the corresponding weapon.
Pause game play, then select the "Extras" option. Select "Cheats", then enter one of the following codes to activate the corresponding cheat function. Note: Enabling cheat codes will permanently disable the autosave feature and the ability to earn achievements or trophies on the current saved game file. Consider saving your game before enabling any of the cheat codes and do not manually save the game afterwards.
Fly under bridges, arches, signs, and other objects to progress in the barnstorming diversions. There is no way to track which ones you already have completed. You only need to complete 75 out of the 128 possible locations.
Snowball's Chance is located in the "Last Chance" area in the northeast section. Sinterpol HQ is in the "Rebellion Square" area in the southwest section, near the highway. Having all Flight Upgrades will make this easier. To ensure success, a good amount of stamina and at least three flaps will be required. Start by going to the roof of Snowball’s Chance Hotel & Casino. Reach the tallest part of the roof then place a map marker for Sinterpol HQ. Charge a jump and sprint in a circle until you are at full speed. When ready, jump towards the middle of the map. At the peak of your jump, start flying. Use one flap early, another one soon afterwards, then a third flap as you pass the large floating building at about halfway to your destination. Maneuver around the building as you fly towards the map marker. Fly directly over it then use "Flight – Hover". You can also hit the peak of the building to qualify. Note: This will not work if you dodged spire missiles along the way.