Bulletstorm

This achievement requires a cumulative score of 75,000 points in Echoes mode. This can be done over the 14 Echo Maps and will most likely be done while attempting the 'Supernova' and 'Hoarder' achievements which requires you to get a 3 star rating on each of the 14 Echo maps.

There shouldn't be any trouble gaining this achievement, even if you aren't that skilled of a player at the game. This should even unlock with a smaller score of 6000 points ATLEAST on each map, which shouldn't be too difficult considering the amount of dropkits available to change guns throughout each level.

If you are having problems the best advice to build higher points up is change guns as often as possible to gain high amounts of different skillshots. However if you do repeat a skillshot continuously its points will lower considerably usually from +150/250 to +50.

Also when there are large amounts of enemies, use the a charged Screamer shot then use the thumper to send them into the air and you will either get Flyswatter or Trapshooting depending if you shoot the air born enemies or let them die on impact of a surface. This method with also earn you the Afterburner and Firefighter skillshots.

Im not sure if this achievement will unlock with you cumulative score on the DLC Echo Maps or not as i don't own the DLC.

You will earn this while working towards

The game tracks your total points in the first row in the Echoes mode level select, so you can easily see your progress. Try to improve your lowest scoring levels first, but see the solution for the above achievement for more detail.