Here is the full list of all 17 Save Jesus achievements. It takes around 5-6 hours to unlock all of the achievements on Windows.
Every Level Completed with Holy Spikes
Every Level Completed with Spiked Balls
Every Level Completed with Ball of Skulls
Every Level Completed with Holy Balls
Every Level Completed with Cows
Every Level Completed with Fireballs
Cause 5 Deaths without a Weapon
Every Level Completed with Boulders
Kill 250 Romans
Collect 150 Stars
Played All Levels
Kill Jesus 50 Times
Kill 100 Romans
Collect 100 Stars
Collect 50 Stars
Collect 25 Stars
Kill 50 Romans