Say I have out Manabond and end up with twenty lands in my hand. When Manabond's trigger resolves(and I put all the land onto the battlefield), one of the lands in my hand is Valakut, the Molten Pinnacle and the rest are Mountains, will I get Valakut's trigger as well?
If you put one or more Valakut, the Molten Pinnacle cards and six or more Mountain cards from your hand onto the battlefield due to Manabond, the last ability of each Valakut, the Molten Pinnacle will trigger once for each Mountain you bring to the battlefield this way (C.R. 603.6a, 603.4).
For example, if you bring two Valakut, the Molten Pinnacle cards and eight Mountain cards onto the battlefield (and don't already control a Valakut, the Molten Pinnacle), the last ability of each Valakut, the Molten Pinnacle will trigger eight times, once for each Mountain, for a total of sixteen times. However, when each such ability would resolve, it will check again whether "you control at least five ... Mountains" other than the Mountain that made that ability trigger (C.R. 603.4, 608.2a). See also this thread.
For example, if you bring two Valakut, the Molten Pinnacle cards and eight Mountain cards onto the battlefield (and don't already control a Valakut, the Molten Pinnacle), the last ability of each Valakut, the Molten Pinnacle will trigger eight times, once for each Mountain, for a total of sixteen times. However, when each such ability would resolve, it will check again whether "you control at least five ... Mountains" other than the Mountain that made that ability trigger (C.R. 603.4, 608.2a). See also this thread.