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@Prime_heretic
The achilles tendon is the strongest tendon in your body and is perfectly capable of supporting your full bodyweight.
With running it's usually one of two causes, with cycling I'm not so sure :
1) You are fully loading the achilles by putting all your weight on the ball of your foot (nothing wrong here) then adding additional load by contracting your calf to push hard on the pedal, in running caused by pushing off.
This is possible I guess when cycling, if you're doing a lot of work with your calves it may be that your seat's a touch too high forcing you to plantar-flex the foot. Your knees should not lock out when your foot's at 6pm, 155 degrees max or summut I think, do you have achy calves post-ride?
2) Heavy pronation/supination, when running heavy pronation/supination causes the tendon to shift laterally left and right resulting in tendonitis, not good considering it's probably loaded with bodyweight when it's doing this.
Again I guess this is possible when cycling if your cleats aren't adjusted properly.
So yeah in summary, check seat height, why not lowering it a bit for a few weeks and see. Check cleat adjustment, don't pedal with your calves. Same advise as everyone else really.