How do I gain this achievement?

[Genghis_Sean]

How do you get something like Tiny Big Planet where you have to win on a tiny map? I see no Tiny option. There are duel maps and small maps, but no tiny ones.

 

[GeoModder]

Pick the smallest map, and you should be golden.

 

[Monado]

Pick "dwarf" planet size.

Either the achievement or game file is mislabeled.

 

[Yzman]

Basically you get achievements for each size of map and each difficulty level ( yes even the easiest one...which doesn't have an achievement labeled on it. It is one of the non labeled achievements)

 

[Jacozilla]

There's also a not so well explained map you need to play, in order to get the achievement for having played on all maps and sizes.

You'll need in addition to all the ones specifically named as individual map achievements, the unnamed Taigan one.