Is there a way where I can get a list all watchers on a Jira ticket?
More context required, from where do you want to do this? If you have MANAGE_WATCHERS permission you can use the UI. See https://confluence.atlassian.com/display/JIRA/Watching+and+Voting+on+an+Issue
If you are code, ComponentAccessor.getIssueManager().getWatchers(anIssue); will get you there.
If you are in REST, http://docs.atlassian.com/jira/REST/latest/#id199925 will get you there too.
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