R-Type Dimensions

Just keep playing and you´ll eventually unlock it. If you want to boost, try Stage 8 from first R-Type, where there are many easy and fast kills, or try Stage 2 from R-Type II. There are many too once the water balloons go up to the ceiling.

Remember that all the kills in all modes count, even if you exit your play. For that same reason, I recommend just trying to get everything else or get high in the leaderboards, because it´s easy to rank all that kills after some hours.

Put the game on infinite, start on level one.

Use your hori pad or any other turbo pad and put the turbo on the a button. it will kill a bunch of guys, respawn, and start a new game you have beaten it.

Leave this on while you sleep at night and you are guaranteed at least 5000 kills per night if not more.

For those unwilling to put much effort into this achievement, try taping/rubber banding down the RT button (= Rapid Fire) and keep restarting Stage 8 of R-Type 1.

Be sure to pick up the first powerup, the yellow pod, manually. This pod will automatically reattach to your rear end each time after you die, which is good for killing enemies coming from behind.

After that you can just let the game play itself. Go do something more useful. Each round will take about 2 minutes and a half, and net you around 220 - 240 kills.

When you hear the force feedback buzz rather hard (harder than when you just die and respawn) you'll know the end boss has been defeated. Rinse and repeat.

For this achievement its a pretty wild grinder. My solution is to play through R-Type 2 its roughly 18 minutes for the entire play through ob infinite mode and you always end up with 1,000+ kills. Its all manual game play and it takes about 9 hours for this.

*Note-You acquire this over time so you don't have to play it all at once. =)