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

RAW (taken directly from Google Ads)

Clicks

Conversion Value

Conversion Value (All)

Conversions

Conversions (All)

Cost

Impressions

COMPUTED (calculated from raw metrics based on Google Ads definitions)

Average Conversion Value

Average Conversion Value (All)

Cost per Conversion

Cost per Conversion (All)

CPC

CPM

CTR

Order Rate

Order Rate (All Conversions)

Revenue per Click

Revenue per Click (All)

Revenue per Impression

Revenue per Impression (All)

ROAS

ROAS (All)