This module lets you import one or multiple instagram feeds from users or hashtags. You do not need API keys since this uses a scraping technique to import the posts.
This module exists out of a main module and a submodule.
The main module Instagram importer will be used for fetching the correct hashtags/users and scraping new posts on cron run. It creates nodes of type Instagram. From there, you will be able to create your own views.
Create an Instagram widget with drupal 8 (part 1)
Create an Instagram widget with drupal 8 (part 2)