All classes that implement ActionInterface

class \Drupal\Core\Action\ActionBase implements ActionInterface
class \Drupal\Core\Action\ConfigurableActionBase implements ConfigurableActionInterface
class \Drupal\action\Plugin\Action\EmailAction
class \Drupal\action\Plugin\Action\GotoAction
class \Drupal\action\Plugin\Action\MessageAction
class \Drupal\action_test\Plugin\Action\NoType
class \Drupal\action_test\Plugin\Action\SaveEntity
class \Drupal\comment\Plugin\Action\PublishComment
class \Drupal\comment\Plugin\Action\SaveComment
class \Drupal\comment\Plugin\Action\UnpublishByKeywordComment
class \Drupal\comment\Plugin\Action\UnpublishComment
class \Drupal\node\Plugin\Action\AssignOwnerNode
class \Drupal\node\Plugin\Action\DeleteNode
class \Drupal\node\Plugin\Action\DemoteNode
class \Drupal\node\Plugin\Action\PromoteNode
class \Drupal\node\Plugin\Action\PublishNode
class \Drupal\node\Plugin\Action\SaveNode
class \Drupal\node\Plugin\Action\StickyNode
class \Drupal\node\Plugin\Action\UnpublishByKeywordNode
class \Drupal\node\Plugin\Action\UnpublishNode
class \Drupal\node\Plugin\Action\UnstickyNode
class \Drupal\user\Plugin\Action\AddRoleUser
class \Drupal\user\Plugin\Action\BlockUser
class \Drupal\user\Plugin\Action\CancelUser
class \Drupal\user\Plugin\Action\ChangeUserRoleBase
class \Drupal\user\Plugin\Action\RemoveRoleUser
class \Drupal\user\Plugin\Action\UnblockUser

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