Here is the full list of all 26 Hero Express achievements.
Reach the end of the Himalaya track
Reach the end of the Great Wall track
Reach the end of the Treasure Island track
Reach the end of the Vulcano track
Reach the end of the Noth Pole track
Reach the end of the Sahara track
Reach the end of the Transylvania track
Reach the end of the Amazon Forest track
Reach the end of the Swamp track
Reach the end of the Moon track
Reach the end of the New York track
Bring all the Tukie Tuk stats to level 7
Bring all the Amber Dragon stats to level 7
Bring all the Kahuna Laguna stats to level 7
Bring all the Flaming Speeder stats to level 7
Bring all the Ice Breaker stats to level 7
Bring all the Duner stats to level 7
Bring all the Undertaker stats to level 7
Bring all the Wild Tiger stats to level 7
Bring all the Transporter 2.0 stats to level 7
Bring all the M-00-N stats to level 7
Bring all the ZEAT stats to level 7
Spend 45 seconds in the air in a single run
Make 10 frontflips in a single run
Make 10 backflips in a single run
Finish every track