Note: work done by hired workers does count, however work done on contracted fields does not - you must own the field for the counter to increase. These achievements are also known to be slow sometimes, so you might have to do a little extra.Note 2: This must be done in a single save game, but is not limited to a single session
Cultivating is turning the soil over for the next crop on a field. Cultivators, Disc Harrows, and Power Harrows should count towards this achievement. Plows and subsoilers might, but they are much slower implements.
Note 3: Direct drill seeders and planters (those that do not require cultivating first) do not seem to count towards this set of achievements.
Continue with this to unlock: