This achievement is for getting 69 coins exactly when you die.
The easiest way I found to get this was to unlock the "Flying Pig" in sector 4 of the gadgets.
The Flying Pig will randomly appear in the game when you have it equipt and drop single coins unless it's broken up.
What I did was fly into coins before I seen a Flying pig by then I had probably 63 coins. I would then drop down and pig up 1 coin at a time from the flying pig till I had 69 then fly up to the roof and wait till I passed the pig (this is necessary since I died before flying past and I hit the pig on the way down and ended up collecting about 20 more coins) then kill myself and POP achievement unlocked.
"I used token gift gadget and then restarted couple of times to get 19 coins and killed myself, then I cashed in the token and voilá 69 coins."