Use the "Initialize Variable" step at the beginning to create an Array. You'll probably have to create one for each of your conditions unless you reset it mid-flow.
Each time you hit the condition, instead of an email step, use the "Append to array" step.
Then at the end, send your email with the respective array in the body.
If you want, you encapsulate it in a "String()" function and also use a "sub()" function to replace quotes and square brackets if you don't like the array formatting.
Please mark as solution if this helps your issue.