Outline the following achievement for Francis Drake I have got:

Francis Drake was one of Elizabeth's sea captains who with the other sea captains challenged the power of mighty Spain by raiding Spanish ships and settlements. He along with the other Sea Captains as well as Elizabeth kept part of the treasure taken from the Spanish Galleons and towns for themselves.

is this good?

Yes.

Sra

P.S. You might not have to capitalize "Galleons."

Your outline is a good start, but it could use some improvement in terms of organization and clarity. Here's an improved version:

I. Introduction
A. Briefly introduce Francis Drake as one of Elizabeth's sea captains
B. Mention the challenge posed to Spain's power through raids on their ships and settlements

II. Raids on Spanish ships
A. Explain Drake's role in raiding Spanish Galleons
B. Highlight other sea captains involved in these raids
C. Briefly mention the purpose of these raids and their impact on Spain

III. Raids on Spanish settlements
A. Describe Drake's involvement in raiding Spanish towns
B. Emphasize the collective efforts of all sea captains
C. Discuss the strategic significance of targeting settlements

IV. Treasure acquired
A. Explain that both Drake and Elizabeth kept a portion of the treasure
B. Mention the reasons behind this arrangement
C. Highlight the implications of this practice

V. Conclusion
A. Summarize Drake's achievements as one of Elizabeth's sea captains
B. Highlight his role in challenging Spain's power

By organizing your outline in this way, you provide a clearer and more structured overview of Francis Drake's achievements.