One Hundred Freaking Million

So annoying. Honestly I don't even think this one is worth the time. It causes my computer to lag when I try to do it and it would take too long anyway.

Beaten...almost. That 100 million requires patience and an open flash program in the background, which my laptop can't handle >.>

Quick pro tip #1:
All of these achievements can be unlocked in unlimited mode, except the 100 million combo one which in regular mode you can't, so if you're trying to get that one, make sure you choose unlimited mode.

Quick pro tip #2:
For the "Twenty For One" quest, you can either put a bumper somewhere in the middle as low as possible, or wait for the buzzsaw which is a lot more efficient. Make sure you put the buzzsaw somewhere low, but not too low, and you can put it near the wall for a fast 20+ combo. Some luck is needed to get the right hit, but won't take too long.

Quick pro tip #3:
For the "100 Turtle Rush" quest, the upgrades don't really matter, the regular groundsaw/laser/bumper combo or another variety, whatever works for you. The trick is to be fast and, this is important, end combos early. Do this instead of waiting and you'll see a big change in the time needed for combos to rise. Also, remember that time runs in the store, so you can't spend time thinking what to get.

Getting the 100m takes a while (before my flash crashed and I lost it), using groundsaws and bumpers very close to the bottom. Takes roughly two layers of overlapping bumpers and a full layer of groundsaws, along with two wind pads on each side pointing down.

Works well when your flow is at 200 for each pipe :)

The trick is to be fast and, this is important, end combos early.

Also, I feel it's faster to end the combos this way:

1.) Stand near the right of the screen, but close enough to the turtles.
2.) Hit the turtles.
3.) (Do not end the combo) Run just barely into the shop. The combo ends automatically.
4.) Run back to the gaming area.
5.) Repeat steps 1 through 5 until satisfied.

I feel the its's quicker to run the short distance than hit the end combo button or at least I noticed less lag in ending combos by going into the shop.

I did the 100,000,000.  It took me 8 hours.  Silly. :)

Strange, I calculated that it took 30 real seconds to get 100,000 combo (with one of my better upgrade combinations). That equals 8 hours 18 min real time to get the 100,000,000. [In the game right now I'm at about 67,000,000
1 hour 30 minutes in game time.] Does this game cause all computers to lag equally?

I got combo 99 on 2 minutes LOL

4 hours real time, 2 hours shows in-game timer... 70kk kombo.

I love the what happens if you have a shell on the floor bouncing at high speeds between a ground saw and the wall.

I recently earned the 100m combo achievement (took me about 6 & 1/2 hours) but found that it wasn't updated to my profile. If I go to the actual game, however, it states that I have in fact unlocked it. Any idea what's going on here?

Nevermind. After about an hour, my profile updated with the quest posted.