Giana Sisters, Sugar Cube, PixelJunk, Swords and Soldiers and Aliens CM have easy 0.1 and 0.25 achievements. 0.5 for Giana Sisters is beating the first boss level with a good rating and isn't too hard either, just takes a bit more time.
The Dishonored 0.5 achievements is beating the first mission of the Knife of Dunwall DLC and can be done relatively quickly. Getting the 0.1 at the sime time seems possible.
the 0.5 for Bioshock 2 and Infinite are for beating the first mission of the DLC (Episode 2 for Infinite) for each one.
FF VII and Oil Rush have easy 0.1 achievements, the others take way longer.