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Elliott's diabolical dilema
Whenever someone backstabs you in an alliance make it your mission to destroy them, it doesn't matter how many times you fail to achieve this as long as you develop a reputation. This way people will always be wary to break an alliance with you, but may of course not get you any alliances at all. A true dilema.

Luke's backstabbing dirty move
This tactic works well in mission risk games. If you have a borderline truce with someone assure them that you don't want anything to do with them, then in one go capture 5 territories to clinch the victory taking 18 territiories. Although next game people won't trust you and will probably still carry a grudge.

Stop and think
When it's your shot annoy everyone by taking an extremely long time, when asked what your doing say "I'm thinking"

Luke's pea-brain strategy
When someone else wants your country don't let them have it.

Ben's Edict
When playing a mission dependant game, do not go straight towards your mission.  Try to trick opposing players into making them think you have to complete a totally different mission.  That way they will try to stop you completing that mission, while you are slowly completing your real mission.

Eyebrow, The Manoeuvre of the*
This move requires two players. Communicate with the player occupying Africa if you are Europe, or vice versa; and form an unspoken treaty with cunning use of eyebrow movement and mutterings of "The Big Kelbasa". The mutterings are important. Proceed to pretend to be gearing up for a massive battle with each other, and give all the other players the shaft with a dual pronged Blitzkreig.

(the Complete) Bastard Tactic*
Wherever you have a lone territory, in a Continent which somebody desperately wants, keep reinforcing. Especially if all of Asia is red, keep a yellow spot of at least 12 armies right in China.

*Credit: Risk