To get all the achievements You need to last for at least 150 seconds.
But to be honest, for the first try I couldn't even last more than 10 seconds. Haha.

This is my final result after quite tired:


203.35s and S+ rank.
Quite interesting isn't it?

The real fact is I'm not an expert on this game, even I have bad reflex. So it's not about difficulty or bad reflex, but about tenacity and tranquility,
and THE TRICKS .

Don't wanna to linger and make you curious even more, so let's go straight into the business.

The main secret tricks are positioning and mouse movement; as seen in the picture below:

• Put the rider on the right side of the screen , no matter whether above, in the middle, or below; but I prefer in the middle.
  
• After You are in the correct position, then no need to use the movement buttons anymore. Just hold still.
  
• The next important thing is mouse positioning. Place the cursor behind the rider with a distance about 1 inch .
  
• And now for the action, You don't need to do much mouse movement. Only move the mouse up and down about 2 inches wide, it covers almost the whole time. The more important your shot hit the target.
  
• If the enemies are too close (behind, under, or above, even precedes You), still, don't use movement buttons; just use the mouse around the rider to hit the selected target(s) and back to it's original position.

By doing this (exactly as instructions above), I can guarantee You will be able to survive for at least 30 seconds. The rest, remember the points above, tenacity and tranquility.
And now the time for some trials! Go on riders!