I would like to post this alternative achievement guide for Gatherer which I will be going for without spending a single penny. The easy and expensive method of unlocking this achievement is buying the pro-player pack with cash will give you 9 each of 10 different power-ups instantly which will unlock this achievement.
The description of this achievement states that you have to "Own 10 Power ups". More accurately, you have to own 10 different power ups.
You start with 4 power ups namely, Quake, Lasers, Time Shift and Magnet. However, you will need additional power-ups that are available as micro-transactions. these are Lucky 7, Bombs, Avalanche, Meteor Storm, Three Strikes, Multiplier, Crusher and Amplifier. More power ups may be announced at a later date.
However, for the gamers who care about gaming and spending as little as possible, based on my first week's experience with Tetris Blitz, there will be a different power-up of the week, the first week being avalanche. Using this power-up repeatedly during that week will result in that power being permanently unlocked in your arsenal. It took me 90 uses of Avalanche to unlock thereafter it's free for the remainder of the week (You can check by pressing the question mark for a tooltip which tells you how many uses you need to unlock the power.)
Based on this experience, it will take 6 weeks to earn from the time you start the game.
My advice therefore, is that if you're planning on getting Eradicator (Clearing 100,000 lines) and Over-Achiever(obtain all xboxlive achievements), you're better off just grinding the weekly power ups on the way to clearing the 100k lines.