Some examples of words that sound like "sh" are "sugar" and "sherbet." In the case of "tissue," the "ss" sound is pronounced differently than "sh" and does not have the same sound. "Pressure" also does not have the "sh" sound.
Mission, passion, pressure.
It is USUALLY pronounced as an s, but not always. There's the -cious words, where it has the sound 'sh': delicious precious specious meretricious etc. (not to mention 'licorice') Similarly, there the 'sh' sound for -cial words like facial and special. Also there are words that have been adopted from other languages but kept a trace of their original pronunciation: Celtic, for example. There are some other pronuniciations for ce, such as cello (pronounced 'chello'), cembalo (chembalo, with a 'k' sound). In the words foci and loci (acceptable plurals of focus and locus) the c is pronounced like a 'k'. The letter 'c' also makes the 'k' sound in the word 'arcing.'
Ci sounds like sh when followed by "on".
Slant-sh (like slant with the additional "sh" sound)
Special Facial Racial
Conscience
In hieroglyphics, the "sh" sound does not have an individual symbol. However, there are symbols for the "s" and "h" sounds separately, which can be combined to represent the "sh" sound in words.
shush crush blush lash
ks as in English. In some words, it is pronounced like the spanish J (an emphatic h sound). In medieval spanish, it was pronounced like SH.
I can only think of compound words such as nightshade, wishbone, cashbox...
Normally like c in "cat", but in some words, like "kino" (cinema) and "kilo", it is pronounced like the kj sound, as in "kjole" (dress). The kj sound sounds like a sh sound to most foreigners, but it's different.