These are the secret achievements. Warning, spoilers may be contained below this point. Some of them are story achievements, while others are simply fun things you can do in the game to kill time or completely accidentally, all of which will surprise you with an achievement when you do them enough times. Honestly, getting the 100 not shot challenge done accidentally is an unexpected pleasure you miss out on if you know about it beforehand. Just remember, using codes to get vehicles will stop you from earning achievements.
- A Brighter Future - Defeated the Ultor Corporation epilogue

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- Vengeance - Exacted revenge on Julius
- Going the Distance - Threw someone a long, long way
- Love thy Neighbor - Grabbed 50 human shields
- Aww Nuts! - Hit 100 lifetime nut shots
- Stilwater welcoming Commitee - Mugged 50 citizens of Stilwater
- I'm Not Addicted - Gambled $500,000 total lifetime
- Trash Talker - Taunted 50 gang members
- Soprano - Sung Along to the Radio
- Still Addicted to Tha Row - Played Saints Row 2 in single player or co-op for a combined 50 hours