Here is the full list of all 17 Nimble Writer achievements.
Write 5,000 words in a day.
Write 4,000 words in a day.
Write 3,000 words in a day.
Write 2,000 words in a day.
Write a total of 10,000 words.
Write a total of 5,000 words.
Write 1,000 words in a day.
Write a total of 1,000 words.
Export a story.
Write a total of 100,000 words.
Write 10,000 words in a day.
Write a total of 20,000 words.
Write a total of 42,000 words.
Write a total of 75,000 words.
Write 2,000 words every day for 7 days.
Write 2,000 words every day for 14 days.
Write 2,000 words every day for 21 days.