The 11th Objectives Update Title update for Crusaders of the Lost Idols has 2 achievements.
Complete the 'Reversion' objective by beating area 750 in the 'Idols Through Time' campaign while your Crusaders de-level ever 25 areas.
Complete the 'Water Guns of Doom' objective by beating area 775 in the 'Amusement Park of Doom' campaign while hoards of water-gun toting monsters attack.