To have access to the full list of metrics available for Pinterest Ads, you can check it in the Custom Reports

RAW (taken directly from Pinterest)

Clicks

Impressions

Outbound Clicks

Spend

Total Conversions Checkout

Total Order Value Checkout

COMPUTED (calculated from raw metrics based on Pinterest definitions)

Average Purchase Value

Cost per Checkout Conversion

CPC

CPC (Outbound)

CPM

CTR

CTR (Outbound)

Order Rate

Revenue per Click

Revenue per Impression

ROAS