Complete 50 Bonus Goals! (there is also an achievement called Bonus Complete for completing your first Bonus Goal.)
when you first start a game it shows a Bonus Objective at the bottom during the loading screen. the game does not indicate when you complete a goal, as i had previously thought. it will only show up the 1st and 50th time because that is when you trigger an achievement. this can be done over any number of games. check the in-game achievement list to see your progress. you do not need to win the game for it to count. there are a variety of goals you can receive, including:
--Send a gift. (click another player, then click the Gift icon.)
--Play a card on its identical match. (i.e. play a red 2 on a red 2.)
--Add a friend. (click another player, then click the Add Friend icon.)
--Play cards 1 through 4. (use at least one 1, 2, 3, and 4 card each during the game.)
--Play in the first 5 seconds of a turn. (play a card during the first 5 seconds of any turn during a game.)
--Draw when you can play a card. (click the draw pile instead, when able to play a card from your hand.)
--Play a reverse on a reverse. (save your reverse card and play it when another reverse card is on top of the pile.)
--Reverse a reverse card twice. (use a reverse card, on top of another person's reverse card, twice during a game. does not have to be consecutive.)
--Successfully challenge a missed Uno. (click the yellow "challenge uno" button that appears when someone plays their next to last card without first pressing Uno.)
--Successfully challenge a Wild Draw Four card. (click Yes to challenge, instead of Draw, when someone plays a Wild Draw Four on you. that player must have been able to play something else besides the Wild Draw Four, otherwise you will end up drawing 6 cards.)
i was told other goals are:
--Use a skip on a player who has Uno.
--Use a reverse on a player who has Uno.
--Use a Draw 2 card on a Draw 2 card.
--Call Uno when you have one card in hand. (press the Uno button after you put out your next to last card instead of before. risks your Uno being challenged which is a two card draw penalty.)
--Win the game using a Wild Draw Four.