I just tested on my Echo:

"Alexa, set an egg timer for 2 minutes"

Alexa: Four fairly quiet beeps plus says, "Your egg timer is done." (repeats until stopped).

If I set a reminder I get a similar response, but she gives me a quiet clunk clunk sound followed by a description of what the timer was set for, (repeats until stopped).

If I set an alarm, she gives me three faint chimes (repeats until stopped).

All of these are really lame in my opinion. If you are not paying attention, you might not even here her. If you have the TV or stereo on, or if you are talking to someone, you might miss the timer, reminder, alarm.

If I set a timer on my iPhone, it will blast me out of the house as it is very loud. So I use the iPhone and let Alexa sleep and dream of a time when she will be much more useful.