I noticed after getting a seed from my friend, ands beating the boss rush (for the first time with cain) I didn't unlock anything. Also I had a seeded run to get Guppy, but that also didn't unlock anything. Do seeded runs count towards anything? Do donation machines show up on seeded runs, and if so, do donations made on seeded runs count?
The Binding of Isaac Rebirth – Can Items Be Unlocked in Seeded Runs?
the-binding-of-isaac-rebirth
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Best Answer
If you enter a seed, you will not be able to earn achievements or unlock items during that run in most cases but some seeds such as "qwop qwop" will still enable achievements while being a consistent seed. There is also no donation machine in the shop (but shop upgrades from previous runs still make more items available).
This is shown by the no achievement icon: