Here is the full list of all 28 Ben 10: Power Trip achievements.
Find all the Toughness Upgrades
Defeat Hex and Save Strudelbek
Find the Omni-Guard
Complete everything in Grashugel Forest
Find all the Trinkets
Find all the Power Upgrades
Complete everything in Mt. Eisburg
Complete all the Scooter Challenges.
Complete everything in Strudelbek City
Find all the Luck Upgrades
Collect all the Records
Defeat the Mountain Power Spring
Unlock Diamondhead
Unlock Rath
Save all the citizens from monsters.
Complete your first Side Mission
Defeat the City Power Spring
Unlock Shockrock
Unlock XLR8
Defeat the Forest Power Spring
Destroy All Decibel Concerts
Destroy 10 Decibel Concerts
Fast travel using the Rust Bucket
Destroy 5 Decibel Concerts
Unlock Four Arms
Defeat your first Void Ruin
Choose your first upgrade
Unlock Heatblast