Trophy Description - Complete Arcade mode without losing all lives, on Experienced difficulty.

Trophy Type - Gold

To unlock it you must complete all five levels from start to finish, without losing all of your lives, on the Experienced difficulty setting. It doesnt matter how many total lives you lose so long as you dont reach the game over screen.
What makes this challenging is that there isnt a ship that excels against every enemy and boss. This causes you to do exceptionally well on some levels and struggle on others. The key to success is practice, practice, practice and being diligent about collecting bombs and lives from saving humans. Luckily the rewards for saving humans is static so you can put forth extra effort on those.

You can find them during the following waves.
Waves: