This table is not created by WebAPI. To get it, you can see this forum post.
The other thing that is a little confusing to me is that you have a ‘webapi’ schema, and you’re looking for the achilles results in the webapi schema. but the webapi schema should be where your WebAPI tables live, while the achilles_* tables are in your ‘results’ schema. There’s several discussions describign how the WebAPI db is separate from your CDM databases, so I’d search the forums for that, but I wanted to call that out because it seems you’re combining your webapi schema and your cdm results schema.
The first error I think has been called out in this issue. I’d need a developer like @Ajit_Londhe or someone from Odysseus to look into the cause. This may be something fixed in a later release.