I'm having a hard time understanding exactly what's going on in this timeline, but nevertheless;
1 - The Congo was given to King Leopold because none of the great powers wanted the others to have it. This would include Austria.
2 - By the time the Scramble for Africa had occurred, Cecil Rhodes had already mapped out and claimed Rhodesia - i.e. Zambia - for the British South Africa Company and therefore Britain. There was a lot of political manoeuvring concerning Katanga in this period as well, because the South Africa Company and the Belgians both wanted it, and it could have gone either way (if Austria controls the Congo, this will be a matter of contention between the supposed allies of Austria and Britain, a la the Fashoda Crisis of 1898 OTL between France and Britain).
3 - A unified Italy goes against Austrian interests in the region, which is why in order to unify OTL, Italy had to go to war with Austria in the 1860's with French backing. You can't just magic the opposite into occurring.
4 - How does Austria achieve its Holy Land colony? Taking this territory from the Ottomans would start a war in the region, a war that Italy (for the sake of Libya) would definitely jump in on, as well as Russia (a wildcard, considering the Crimean War). In addition, Germany had some serious economic interest in the surviving Ottoman Empire, including the Berlin-Baghdad Railway, so they value a surviving Ottoman state, and thus would be opposed to Austrian interfering in the region.
5 - As in OTL, Italy be unable to achieve a colony in Tunisia so long as the French have a lingering presence there. The pretext of the French protectorate was a large loan of money to the bey of Tunisia, and to curb growing Italian and British influence in the region. In the end, the British settled for Cyprus while the French took Tunisia, with the Italians protesting in vain (as they could do nothing).
6 - From a purely logical perspective, your Austrian colonies make no sense. Austria is a second-rate power, and despite an alliance with Britain, the British have already established something of a network of colonies from Cape to Cairo, with the exception of German East Africa. If the Austrians are going against Turkey for the Holy Land, Libya makes a more realistic and appealing target, as it is closer (being on the Mediterranean coast). The Italians won't do anything about it, since, according to your timeline, they are essentially relying on Austria for survival.
Edit: Also, what chief port did the Italians gain in Tunisia, and what year was this in? The French protectorate was established in 1881. The only chief port on the east coast I can think of is Sfax, which the French took with their navy after a brief insurrection. Any actions by the Italians in this region would be met with open hostility from the French.
Edit 2: How on earth did the British gain the Ivory Coast, and the French the Gold Coast? The Gold Coast Colony was covered in British, Dutch, and Danish ports for most of modern history, but all the Dutch and Danish posts were sold to the British over time, allowing them to found their colony. The pretext here was the disruption of trade in the region due to the Ashante Wars. The Ivory Coast was a major area of French interest up until the Franco-Prussian War, but during that time European interests in Africa were minimal anyway. Same with Guinea. These colonies weren't just randomly added to the map; there was historical context behind penetration of the interior of Africa from the various points in which it happened. There's no way Spain can get its hands on Togoland; the Germans had it in 1884 via two separate protectorates with local chiefs.
Also, Sierra Leone is another British colony you've randomly given to the French.