Cutscene triggered when objective is met (or item has been used)

[christo493]

As the title says, I want to make a cutscene (I know how) when something has been used.
As an example, in my scene, there is a pillar in the middle with missing pieces. When the player has collected ALL pieces, it will play a cutscene. Because of this, I can't simply add a trigger zone.
Are there any ways of doing this without using unrealscript? Is there any other way going around this?

[christo493]

Does anyone have any ideas? Or need any more information to know what i'm talking about?